If you are working with SQL server CLR objects there’s a higher possibility that you might encounter the following error.
“Msg 6263, Level 16, State 1, Line 1
Execution of user code in the .NET Framework is disabled. Enable "clr enabled" configuration option”
To overcome this, you have to reconfigure the SQL server to enable CLR objects. To do that, you can use the following commands.
exec sp_configure 'clr_enable','1'
RECONFIGURE
Note : CLR objects only works with SQL server 2005 and later versions.
CLR Objects Tutorial
Thursday, May 14, 2009
Wednesday, May 6, 2009
Using HP Bluetooth Devices with Microsoft Bluetooth Stack
I usually prefer to use the Microsoft Bluetooth stack (included with Windows XP SP2) instead of the WIDCOMM stack because it requires less recourse, is faster and also easier to use. The only thing missing is support for any Audio profile.
However, if you have a lot of HP notebooks or tablets, you normally can't use the Microsoft stack since it doesn't know the build-in "HP integrated module with Bluetooth wireless technology". But there is a way to do it anyway…
First, remove the WIDCOMM stack using Control Panel -> Add/Remove Programs. Next, restart you computer and open up "Device Manager" (execute Devmgmt.msc). The above noted device will appear as "Unknown device".
Next, open C:\WINDOWS\inf and open the file "BTH.inf" with Notepad. It will start with something like this:
Scroll down until you find the following lines:
Duplicate the last line and append it to the same section. Then change the PID as described below. The section should now look like this:
Note that we only have changed the last characters to the PID (Product ID) of the Bluetooth device. If you have a new laptop the PID might have changed. You can get this PID by double-clicking the device and using the details tab.
Save the BTH.INF, go back to Device Manager and select "Scan for Hardware changes". The device should now start to install. It might happen that the device is after reported as having a problem. If this happens, simple right-click it, select "Disable" and after that "Enable" again.
That should do the trick and you can use the Microsoft stack with the "HP integrated module with Bluetooth wireless technology".
Enjoy!
However, if you have a lot of HP notebooks or tablets, you normally can't use the Microsoft stack since it doesn't know the build-in "HP integrated module with Bluetooth wireless technology". But there is a way to do it anyway…
First, remove the WIDCOMM stack using Control Panel -> Add/Remove Programs. Next, restart you computer and open up "Device Manager" (execute Devmgmt.msc). The above noted device will appear as "Unknown device".
Next, open C:\WINDOWS\inf and open the file "BTH.inf" with Notepad. It will start with something like this:
Code:
; Microsoft Windows Bluetooth Driver INF ; Copyright (c) 2002 Microsoft Corporation
Code:
[HP.NT.5.1] "HP USB BT Transceiver [1.2]" = BthUsb, USB\Vid_03F0&Pid_0C24
Code:
[HP.NT.5.1] "HP USB BT Transceiver [1.2]"= BthUsb, USB\Vid_03F0&Pid_0C24
"HP USB BT Transceiver [Patched]" = BthUsb, USB\Vid_03F0&Pid_011D
Save the BTH.INF, go back to Device Manager and select "Scan for Hardware changes". The device should now start to install. It might happen that the device is after reported as having a problem. If this happens, simple right-click it, select "Disable" and after that "Enable" again.
That should do the trick and you can use the Microsoft stack with the "HP integrated module with Bluetooth wireless technology".
Enjoy!
Tuesday, February 24, 2009
Displaying custom assemblies in ".NET References" dialog of VS.NET 2005
The items in the ".NET References" dialog are not necessarily in the GAC. They are actually in another directory which is defined in the registry.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\AssemblyFolders\Foo\
Set the value of "Default" key to the path of the common assembly folder.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\AssemblyFolders\
Set the value of "Default" key to the path of the common assembly folder.
Friday, November 21, 2008
C# Nullable Numeric Data Types
What About .NET 1.1?
The nullable types described in this article were introduced to the C# programming language with version 2.0 of the .NET framework. In order to achieve similar results using earlier framework versions, the developer must create a new structure or class. Structures will be looked at in a later article.
Null Value
When a program works with numeric information, particularly when it utilises information in a database, it is often the case that a value is undefined. An example of this is when a series of simple yes / no questions is asked and the result of each question held in a Boolean format. After a question is answered, the Boolean value can be set to either true or false to indicate the result. However, before the answer is given what should the value hold? The answer is null.
Nullable Numeric Data Types
Null is a special value that represents information that has not yet been defined. When the C# language was originally defined, the value null existed but could not be applied to numeric variables. In .NET framework 2.0, Microsoft rectified this problem by introducing nullable versions of these data types. Prior to this, the developer would need to work around this problem using values that would not normally be used by the variable or by holding a Boolean value indicating whether the numeric variable should be considered as defined or not.
All of the basic numeric data types have nullable equivalents. There are several ways to declare a variable as a nullable type. The simplest and most readable method is to simply append a question mark (?) to the data type. The following example shows the declaration and assignment of several nullable variables:
int? nullableInt;
int? nullValue = null;
int? notNull = 123;
bool? answer1 = true;
bool? answer2 = false;
bool? answer3 = null;
You can see from the above example that creating a nullable variable is similar to creating a standard numeric variable. As with other numeric variables, a value must be assigned to a variable before it is used, even if that value is null. The following code produces an error if you attempt to compile it.
int? nullableInt;
int? copy = nullableInt; // Invalid as nullableInt is not yet assigned
Data Type Conversion
Numeric nullable data types include very similar implicit and explicit conversion between the various sizes of nullable integers and floating point values. Values can also be converted between their nullable and non-nullable versions. As you would expect, conversion between two incompatibly sized types requires a cast statement, as does casting from a nullable to a non-nullable type.
int standardInteger = 123;
int? nullableInteger;
decimal standardDecimal = 12.34M;
// Implicit conversion from int to int?
nullableInteger = standardInteger;
// Explicit conversion from int? to int
standardInteger = (int)nullableInteger;
// Explicit cast from decimal to int?
nullableInteger = (int?)standardDecimal;
Care must be taken when casting a nullable value as a non-nullable data type. If the value of the nullable data type is null, this cannot be represented in the destination value and a run-time error will occur. This can be avoided by checking if the value is set to null before attempting the conversion.
Arithmetic Operators
The standard arithmetic operators can be used with numeric nullable data types. However, if the value of any of the operands is null, the result will always be null regardless of any other values.
int? a = 55;
int? n = null;
int? result;
result = a * 2; // result = 110
result = a * n; // result = null
Boolean Operators
When using nullable Boolean data types, the binary standard Boolean logical operators can be used. Where both of the operands used are set to either true or false, the results of the operation are exactly the same as for non-nullable Booleans. Where one or both of the operands used in a logical operation are set to null, the result is usually null. There are two special cases where this does not happen. In a logic OR operation, if any value is true then the result is true, even if the other operand is null. For logical AND operations, if either value is false then the result is also false.
bool? result;
result = true & null; // result = null
result = false & null; // result = false
result = true | null; // result = true
result = false | null; // result = null
result = true ^ null; // result = null
result = false ^ null; // result = null
Relational Operators
The relational operators are all valid for use with nullable numeric data types. However, when the value being compared is null, the results are not always as expected. The equal to and not equal to operators are able to make comparisons with both numeric and null values. With all of the other relational operators, the result of the comparison is always false when a value being compared is null.
int? a = 55;
int? n = null;
bool result;
result = a == n; // result = false
result = a != n; // result = true
result = n == null; // result = true
result = a > n; // result = false
result = a < result =" false" style="font-weight: bold;">Testing for Null Values
The previous section showed the use of the relational operators with numeric nullable types. Included in the examples you can see that it is possible to use the equal to or not equal to operators to test if the value of a variable is null. In addition to these operators, the nullable data types define several properties and methods for checking if the value is null and for retrieving the value where it is not.
HasValue Property
The first property of the numeric nullable types of interest is the HasValue property. This property simply returns a Boolean value indicating whether the nullable variable contains a real value or a null value. To access the value of a property, the member access operator is used. This is simply a full stop (period or dot) placed between the name of the variable and the name of the member (property or method) to be used. The following example shows the HasValue property used to set a non-nullable value to the value of a nullable type with a default value of -1 where the nullable variable has no value.
int? a = 10;
int? n = null;
int result;
bool checkIfNull;
checkIfNull = a.HasValue; // checkIfNull = true
result = checkIfNull ? (int)a : -1; // result = 10
checkIfNull = n.HasValue; // checkIfNull = false
result = checkIfNull ? (int)n : -1; // result = -1
Value Property
The numeric nullable data types include a second property that can be used to retrieve the value from a variable as a non-nullable type. This provides the same effect as a cast from a nullable type to its non-nullable counterpart. As with this type of cast however, a run-time error will occur should the value of the variable be null. The previous example can therefore also be written as follows:
int? a = 10;
int? n = null;
int result;
bool checkIfNull;
checkIfNull = a.HasValue; // checkIfNull = true
result = checkIfNull ? a.Value : -1; // result = 10
checkIfNull = n.HasValue; // checkIfNull = false
result = checkIfNull ? n.Value : -1; // result = -1
result = n.Value; // This causes a run-time error.
GetValueOrDefault Method
The GetValueOrDefault method is available to all of the numeric nullable data types. This method provides all of the functionality of the previous example in a single line of code. The method can be called in two ways. If the method is used without a parameter then the numeric value of the nullable data is returned. If the variable in question has a null value, a zero is returned instead. The second manner to call the method includes passing a parameter to specify the default value to replace nulls with. As with all methods, the parameter is held in parentheses with an empty pair of parentheses should no parameter be specified.
int? a = 10;
int? n = null;
int result;
result = a.GetValueOrDefault(); // result = 10
result = n.GetValueOrDefault(); // result = 0
result = n.GetValueOrDefault(-1); // result = -1
The Null Coalescing Operator
The null coalescing operator is a new operator introduced as a part of the .NET framework version 2.0. This operator can be used on any numeric nullable data type and also other nullable data types that have yet to be introduced in the C# Fundamentals tutorial.
The null coalescing operator tests the value of a variable to check if it is null. If the value is not null then the variable's value is returned unaffected. If the variable is null however, a substitute value is provided as a second operand. The operator provides similar functionality to the GetValueOrDefault method with the benefit that it can be used on data that does not provide this functionality. The operator's symbol is a double question mark (??).
int? a = 10;
int? n = null;
int result;
result = a ?? -1; // result = 10
result = n ?? -1; // result = -1
Citation here
The nullable types described in this article were introduced to the C# programming language with version 2.0 of the .NET framework. In order to achieve similar results using earlier framework versions, the developer must create a new structure or class. Structures will be looked at in a later article.
Null Value
When a program works with numeric information, particularly when it utilises information in a database, it is often the case that a value is undefined. An example of this is when a series of simple yes / no questions is asked and the result of each question held in a Boolean format. After a question is answered, the Boolean value can be set to either true or false to indicate the result. However, before the answer is given what should the value hold? The answer is null.
Nullable Numeric Data Types
Null is a special value that represents information that has not yet been defined. When the C# language was originally defined, the value null existed but could not be applied to numeric variables. In .NET framework 2.0, Microsoft rectified this problem by introducing nullable versions of these data types. Prior to this, the developer would need to work around this problem using values that would not normally be used by the variable or by holding a Boolean value indicating whether the numeric variable should be considered as defined or not.
All of the basic numeric data types have nullable equivalents. There are several ways to declare a variable as a nullable type. The simplest and most readable method is to simply append a question mark (?) to the data type. The following example shows the declaration and assignment of several nullable variables:
int? nullableInt;
int? nullValue = null;
int? notNull = 123;
bool? answer1 = true;
bool? answer2 = false;
bool? answer3 = null;
You can see from the above example that creating a nullable variable is similar to creating a standard numeric variable. As with other numeric variables, a value must be assigned to a variable before it is used, even if that value is null. The following code produces an error if you attempt to compile it.
int? nullableInt;
int? copy = nullableInt; // Invalid as nullableInt is not yet assigned
Data Type Conversion
Numeric nullable data types include very similar implicit and explicit conversion between the various sizes of nullable integers and floating point values. Values can also be converted between their nullable and non-nullable versions. As you would expect, conversion between two incompatibly sized types requires a cast statement, as does casting from a nullable to a non-nullable type.
int standardInteger = 123;
int? nullableInteger;
decimal standardDecimal = 12.34M;
// Implicit conversion from int to int?
nullableInteger = standardInteger;
// Explicit conversion from int? to int
standardInteger = (int)nullableInteger;
// Explicit cast from decimal to int?
nullableInteger = (int?)standardDecimal;
Care must be taken when casting a nullable value as a non-nullable data type. If the value of the nullable data type is null, this cannot be represented in the destination value and a run-time error will occur. This can be avoided by checking if the value is set to null before attempting the conversion.
Arithmetic Operators
The standard arithmetic operators can be used with numeric nullable data types. However, if the value of any of the operands is null, the result will always be null regardless of any other values.
int? a = 55;
int? n = null;
int? result;
result = a * 2; // result = 110
result = a * n; // result = null
Boolean Operators
When using nullable Boolean data types, the binary standard Boolean logical operators can be used. Where both of the operands used are set to either true or false, the results of the operation are exactly the same as for non-nullable Booleans. Where one or both of the operands used in a logical operation are set to null, the result is usually null. There are two special cases where this does not happen. In a logic OR operation, if any value is true then the result is true, even if the other operand is null. For logical AND operations, if either value is false then the result is also false.
bool? result;
result = true & null; // result = null
result = false & null; // result = false
result = true | null; // result = true
result = false | null; // result = null
result = true ^ null; // result = null
result = false ^ null; // result = null
Relational Operators
The relational operators are all valid for use with nullable numeric data types. However, when the value being compared is null, the results are not always as expected. The equal to and not equal to operators are able to make comparisons with both numeric and null values. With all of the other relational operators, the result of the comparison is always false when a value being compared is null.
int? a = 55;
int? n = null;
bool result;
result = a == n; // result = false
result = a != n; // result = true
result = n == null; // result = true
result = a > n; // result = false
result = a < result =" false" style="font-weight: bold;">Testing for Null Values
The previous section showed the use of the relational operators with numeric nullable types. Included in the examples you can see that it is possible to use the equal to or not equal to operators to test if the value of a variable is null. In addition to these operators, the nullable data types define several properties and methods for checking if the value is null and for retrieving the value where it is not.
HasValue Property
The first property of the numeric nullable types of interest is the HasValue property. This property simply returns a Boolean value indicating whether the nullable variable contains a real value or a null value. To access the value of a property, the member access operator is used. This is simply a full stop (period or dot) placed between the name of the variable and the name of the member (property or method) to be used. The following example shows the HasValue property used to set a non-nullable value to the value of a nullable type with a default value of -1 where the nullable variable has no value.
int? a = 10;
int? n = null;
int result;
bool checkIfNull;
checkIfNull = a.HasValue; // checkIfNull = true
result = checkIfNull ? (int)a : -1; // result = 10
checkIfNull = n.HasValue; // checkIfNull = false
result = checkIfNull ? (int)n : -1; // result = -1
Value Property
The numeric nullable data types include a second property that can be used to retrieve the value from a variable as a non-nullable type. This provides the same effect as a cast from a nullable type to its non-nullable counterpart. As with this type of cast however, a run-time error will occur should the value of the variable be null. The previous example can therefore also be written as follows:
int? a = 10;
int? n = null;
int result;
bool checkIfNull;
checkIfNull = a.HasValue; // checkIfNull = true
result = checkIfNull ? a.Value : -1; // result = 10
checkIfNull = n.HasValue; // checkIfNull = false
result = checkIfNull ? n.Value : -1; // result = -1
result = n.Value; // This causes a run-time error.
GetValueOrDefault Method
The GetValueOrDefault method is available to all of the numeric nullable data types. This method provides all of the functionality of the previous example in a single line of code. The method can be called in two ways. If the method is used without a parameter then the numeric value of the nullable data is returned. If the variable in question has a null value, a zero is returned instead. The second manner to call the method includes passing a parameter to specify the default value to replace nulls with. As with all methods, the parameter is held in parentheses with an empty pair of parentheses should no parameter be specified.
int? a = 10;
int? n = null;
int result;
result = a.GetValueOrDefault(); // result = 10
result = n.GetValueOrDefault(); // result = 0
result = n.GetValueOrDefault(-1); // result = -1
The Null Coalescing Operator
The null coalescing operator is a new operator introduced as a part of the .NET framework version 2.0. This operator can be used on any numeric nullable data type and also other nullable data types that have yet to be introduced in the C# Fundamentals tutorial.
The null coalescing operator tests the value of a variable to check if it is null. If the value is not null then the variable's value is returned unaffected. If the variable is null however, a substitute value is provided as a second operand. The operator provides similar functionality to the GetValueOrDefault method with the benefit that it can be used on data that does not provide this functionality. The operator's symbol is a double question mark (??).
int? a = 10;
int? n = null;
int result;
result = a ?? -1; // result = 10
result = n ?? -1; // result = -1
Citation here
Wednesday, November 12, 2008
Say Hello to Gmail Voice & Video Chat
I'm a big user of Gmail chat. Being able to switch from email to chat as needed, all within the same app, is really great for productivity. But people can only type so fast, and even with our new emoticons, there are still some things that just can't be expressed in a chat message.
That's why today Google is launching voice and video chat -- right inside Gmail. They've tried to make this an easy-to-use, seamless experience, with high-quality audio and video -- all for free. All you have to do is download and install the voice and video plugin and it'll take care of the rest. And in the spirit of open communications, designed this feature using Internet standards such as XMPP, RTP, and H.264, which means that third-party applications and networks can choose to interoperate with Gmail voice and video chat.
Once you install the plugin, to start a video chat, just click on the "Video & more" menu at the bottom of your Gmail chat window, and choose "Start video chat." You'll have a few seconds to make sure you look presentable while it's ringing, and then you'll see and hear your friend live, right from within Gmail. You can click the "pop-out" iconto make the video larger, or click the fullscreen iconin the upper left-hand corner for a fully immersive experience. See this all in action in the video below.
Team is spread between Google offices in the US and Sweden, and video has really changed the way we work. Collaborating across continents and timezones is a fact of life, and it sure is easier (and greener) to click "Start video chat" than to get on a plane! And when I do have to visit another office, I can use Gmail voice and video chat to check in with my family.
They've just started to roll out Gmail voice and video chat for both PCs and Macs, so if you don't see it right away, don't worry -- it could take a day or so for this feature to be available in all Gmail and Google Apps accounts. If you want to download the plugin right away, visit http://gmail.com/videochat.
Citation here
That's why today Google is launching voice and video chat -- right inside Gmail. They've tried to make this an easy-to-use, seamless experience, with high-quality audio and video -- all for free. All you have to do is download and install the voice and video plugin and it'll take care of the rest. And in the spirit of open communications, designed this feature using Internet standards such as XMPP, RTP, and H.264, which means that third-party applications and networks can choose to interoperate with Gmail voice and video chat.
Once you install the plugin, to start a video chat, just click on the "Video & more" menu at the bottom of your Gmail chat window, and choose "Start video chat." You'll have a few seconds to make sure you look presentable while it's ringing, and then you'll see and hear your friend live, right from within Gmail. You can click the "pop-out" iconto make the video larger, or click the fullscreen iconin the upper left-hand corner for a fully immersive experience. See this all in action in the video below.
Team is spread between Google offices in the US and Sweden, and video has really changed the way we work. Collaborating across continents and timezones is a fact of life, and it sure is easier (and greener) to click "Start video chat" than to get on a plane! And when I do have to visit another office, I can use Gmail voice and video chat to check in with my family.
They've just started to roll out Gmail voice and video chat for both PCs and Macs, so if you don't see it right away, don't worry -- it could take a day or so for this feature to be available in all Gmail and Google Apps accounts. If you want to download the plugin right away, visit http://gmail.com/videochat.
Citation here
Custom shortcuts in the Windows XP dialog box
This will guide you in setting custom “shortcuts” in the Windows XP “Save As” dialog box.
Note: This also works in Windows Vista Ultimate Edition, but not sure about the other versions of Vista.
1. Click Start and select Run. In the Run window enter gpedit.msc and click OK.
2. The Group Policy editor will appear.
3. In the left window select the + (plus sign) next to User Configuration to expand the list. Next select the plus sign next to Administrative Templates and then Windows Explorer. Finally, select the Common Open File Dialog entry.
4. Double-click the Items displayed in Places Bar entry in the main Group Policy window.
5. The Items displayed in Places Bar Properties window will open.
6. Select Enabled and then enter in the locations you’d like to have displayed in the Save As dialog box. You need to enter the full path to the location for the shortcuts to work.
For example, if you want to have a shortcut to your My Documents folder, enter in:
C:\Documents and Settings\Your User Name\My Documents\
7. Once you’ve entered in all the locations you’d like to appear in the Save As window, click Apply and then OK.
8. Back in the Group Policy editor, you should see that the Items displayed in Places Bar is now Enabled. Close the Group Policy editor.
9. Test it out by saving a file. You should now have the new shortcuts displayed.
10. The same shortcuts will be used in the Open dialog box, not just the Save As box.
Citation here
Note: This also works in Windows Vista Ultimate Edition, but not sure about the other versions of Vista.
1. Click Start and select Run. In the Run window enter gpedit.msc and click OK.
2. The Group Policy editor will appear.
3. In the left window select the + (plus sign) next to User Configuration to expand the list. Next select the plus sign next to Administrative Templates and then Windows Explorer. Finally, select the Common Open File Dialog entry.
4. Double-click the Items displayed in Places Bar entry in the main Group Policy window.
5. The Items displayed in Places Bar Properties window will open.
6. Select Enabled and then enter in the locations you’d like to have displayed in the Save As dialog box. You need to enter the full path to the location for the shortcuts to work.
For example, if you want to have a shortcut to your My Documents folder, enter in:
C:\Documents and Settings\Your User Name\My Documents\
7. Once you’ve entered in all the locations you’d like to appear in the Save As window, click Apply and then OK.
8. Back in the Group Policy editor, you should see that the Items displayed in Places Bar is now Enabled. Close the Group Policy editor.
9. Test it out by saving a file. You should now have the new shortcuts displayed.
10. The same shortcuts will be used in the Open dialog box, not just the Save As box.
Citation here
Sunday, May 25, 2008
How to set up and use remote debugging in Visual Studio .NET?
The Remote Debugging Monitor (Msvsmon.exe) is a small application that Visual Studio 2005 connects to for remote debugging. During remote debugging, Visual Studio 2005 runs on one computer (the debugger host) and the Remote Debugging Monitor runs on the remote computer along with the application you are debugging.
The Remote Debugging Monitor runs as a Microsoft Windows application. The user interface shows that the Remote Debugging Monitor is running and makes remote debugging easy to set up.
Let's consider an example to understand this situation clearly. Molly Clark and Adam Barr are both employees at Adventure Works. Adventure Works has a Microsoft Windows NT domain named adventure-works.com. Adam is having trouble with some software that Molly wrote. Molly would like to debug this software on Adam's computer. Molly and Adam follow these steps:
http://support.microsoft.com/kb/910448
http://support.microsoft.com/kb/318041
The Remote Debugging Monitor runs as a Microsoft Windows application. The user interface shows that the Remote Debugging Monitor is running and makes remote debugging easy to set up.
Let's consider an example to understand this situation clearly. Molly Clark and Adam Barr are both employees at Adventure Works. Adventure Works has a Microsoft Windows NT domain named adventure-works.com. Adam is having trouble with some software that Molly wrote. Molly would like to debug this software on Adam's computer. Molly and Adam follow these steps:
- Adam doesn't have the remote debugger on his computer. To set up the remote debugger, Molly decides to share out the Program Files\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger directory on her computer. She creates a file share called Remote.
- Adam runs \\MollyComputerName\Remote\x86\Msvsmon.exe.
- After the remote debugger starts, Adam clicks Permissions on the Tools menu to configure the remote debugger by using the Permissions dialog box. He gives Molly permission to debug.
- Note: Adam could also configure the remote debugger by passing the /allow option when the remote debugger starts.
- Molly starts Visual Studio 2005.
- To open the Attach to Process dialog box, Molly clicks Attach to Process on the Tools menu.
- Molly connects to Adam's computer by entering adventure-works.com\Adam@AdamComputerName in the Qualifier box.
- Under Available Processes, Molly selects the worker process that her application is using and then clicks Attach.
- Molly opens a browser and provides the URL to the remote application. The execution stops where the breakpoint is placed in the application.
http://support.microsoft.com/kb/910448
http://support.microsoft.com/kb/318041
Saturday, May 24, 2008
log4net - Quick Reference
log4net is a tool to help the programmer output log statements to a variety of output targets. In case of problems with an application, it is helpful to enable logging so that the problem can be located. With log4net it is possible to enable logging at runtime without modifying the application binary. The log4net package is designed so that log statements can remain in shipped code without incurring a high performance cost. It follows that the speed of logging (or rather not logging) is crucial.
At the same time, log output can be so voluminous that it quickly becomes overwhelming. One of the distinctive features of log4net is the notion of hierarchical loggers. Using these loggers it is possible to selectively control which log statements are output at arbitrary granularity. log4net is designed with two distinct goals in mind: speed and flexibility.
For more technical details and details, visit
Friday, May 9, 2008
Google Account Hijacked???
It can be a nightmare if someone else takes control of your Google Account because all your Google services like Gmail, Orkut, Google Calendar, Blogger, AdSense, Google Docs and even Google Checkout are tied to the same account.
Here are some options suggested by Google Support when your forget the Gmail password or if someone else takes ownership of your Google Account and changes the password:
1. Reset Your Google Account Password:
Type the email address associated with your Google Account or Gmail user name at google.com/accounts/ForgotPasswd - you will receive an email at your secondary email address with a link to reset your Google Account Password.
This will not work if the other person has changed your secondary email address or if you no longer have access to that address.
2. For Google Accounts Associated with Gmail
If you have problems while logging into your Gmail account, you can consider contacting Google by filling this form. It however requires you to remember the exact date when you created that Gmail account.
3. For Hijacked Google Accounts Not Linked to Gmail
If your Google Account doesn’t use a Gmail address, contact Google by filling this form. This approach may help bring back your Google Account if you religiously preserve all your old emails. You will be required to know the exact creation date of your Google Account plus a copy of that original “Google Email Verification” message.
It may be slightly tough to get your Google Account back but definitely not impossible if you have the relevant information in your secondary email mailbox.
Gmail has limits!
Gmail imposes a limit on the attachment size (20 MB) and the overall storage space (6 GB and growing) but there’s also a daily quote on sending email. Break the rules and Google will disable you Gmail account temporarily without any warnings.
So while sending an email message to a large group of friends using Gmail, read the following rules to avoid temporary shut-down of Gmail:
Rule 1. If you access Gmail via POP or IMAP clients (like Microsoft Outlook), you can send an email message to a maximum of 100 people at a time. Cross the limit and your account will be disabled for a day with the error "550 5.4.5 Daily sending quota exceeded."
Rule 2. If you access Gmail from the browser, you may not address an email message to more than 500 people at a time. Try adding any more recipients in the To, CC or BCC field and your Gmail account will get probably disabled for 24-72 hours. Error: "Gmail Lockdown in Secton 4"
Rule 3. Always double check email addresses of recipients before hitting the Send button in Gmail. That’s because your account will get disabled if the email message contains a large number of non-existent or broken addresses (<25>
Rule 4. This is slightly unrelated but still important - Google will disable your Gmail account permanently if you don’t check your Gmail email for a period of nine months. All the stored messages will be deleted and you Gmail address (user name) may be released for others to grab it.
Sources: Beth Kanter, Gmail Policies, Sending Limits
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