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Are you remove system.web.dll from references and add it again?
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no i didn.t<br />
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i &nbsp;did &nbsp;reinstall windows vista<br />

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i've developing with c# .net visual studio 2005<br />
i have developing without problems<br />
sudenly system dive problem<br />
allways i wan t to switch at any form to design view the system send a message &quot;adding system.web.dll&quot; and slow system so much<br />
<br />
i dnt know what happend..it occurs sudenly and i can't avoid this problem 
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i've developing with c# .net visual studio 2005
i have developing without problems
sudenly system dive problem
allways i wan t to switch at any form to design view the system send a message "adding system.web.dll" and slow system so much

i dnt know what happend..it occurs sudenly and i can't avoid this problem 

poblem c# deven process adding system.web.dll

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.