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.

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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...