If it is being updated dynamically then it must be inside another UpdatePanel

There was two update panels.one have a button control and another one was within asp panel.when i hit the button this error occured.I put the asp panel within update panel.Now it is ok.but i couldn't find the reason for getting that error.

Have to hit twise button withing update panel in asp:panel

not resolved

The file is being used by another process

This occured when i send a mail with attachement and replace that attachment file with same name at same time.simplly called Dispose method in finally block for attachement object.solved it.

System.IO.IOException: Expected > for tag: <{1}/>

This take place when i was generating gridview to pdf document.In my gridview there are some < characters.simply replace < character with &lt; in gridview rowdatabound event.now it is work.

Related articles http://www.c-sharpcorner.com/UploadFile/515294/5205/
http://www.c-sharpcorner.com/UploadFile/515294/5201/

When debuging the project not point to break point VS 2008

here the solution
http://geekswithblogs.net/dbutscher/archive/2007/06/26/113472.aspx

System.ArgumentOutOfRangeException: Index and length must refer to a location within the string

{
{
additionalcharges =
}
if (transinfodum.additionalcharge.ToString() != "")if (transinfodum.additionalcharge.ToString().Substring(0, 1) == "-")"Discount " + transinfodum.additionalcharge.ToString().Substring(1);else{
additionalcharges = transinfodum.additionalcharge.ToString();
}
}
 

this is takeplace when i was getting a sub string from a null string value.
solved it...

Unknown server tag 'cc1:CalendarExtender'.

This is due to ajax version.put the correct version..

Embedded statement cannot be a declaration or labeled statement

http://msdn.microsoft.com/en-us/library/xaw06638(VS.80).aspx

Sys.InvalidOperationException: ScriptLoader.loadScripts cannot be called while the ScriptLoader is already loading scripts.

Solved..put this script

<script type="text/javascript" language="javascript">
var prm=Sys.WebForms.PageRequestManager.getInstance();
prm.add_initializeRequest(initializeRequest);

function initializeRequest(sender,args){
if(prm.get_isInAsyncPostBack())
args.set_cancel(true);
}
</script>
 

Sys.WebForms.PageRequestManagerServerErrorException: Specified cast is not valid.

not resolved yet

ChangeConflictException: Row not found or changed.

 I love this unclear exception message. After reading several article on concurrency regarding Linq to SQL and making sure the date field was sent correctly, I finally pin-pointed the problem when I remembered that I had changed a NOT NULL column to a NULL column.Problem solved!