Error run file in vs2008

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When I run my project it give the following error

<pre>Error 10 The type 'System.Web.UI.UpdatePanel' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll' and 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\1.0.61025.0__31bf3856ad364e35\System.Web.Extensions.dll' F:\udhay\Mathi_Downloaded_2008\ViewItem.aspx 9

Please help me what can i do

Posted 7-Aug-12 2:28am

devausha

Updated 7-Aug-12 3:09am

Wes Aday

v3

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Sandeep Mewara · Answer 1 · 2012-08-07T03:58:00

Solution 1

Looks like you have two versions of System.Web.Extension.dll in your GAC. Either remove one that is not needed or explicitly define the dll reference in your web.config file.

Posted 7-Aug-12 3:58am

Sandeep Mewara

Comments

devausha 7-Aug-12 23:43pm

How can I remove it. Which is I have to remove from web config file

devausha 7-Aug-12 23:46pm

How to delete the dll file in Gac

Sandeep Mewara 8-Aug-12 3:19am

Here: http://msdn.microsoft.com/en-us/library/aa559881%28v=bts.20%29.aspx