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Error while upgrading VS 2005 to VS 2010

Hi,

I have installed VS 2010 and want to upgrade all code written in VS 2005 to VS 2010.

Please note that we do not have VS 2008, all code are in C# 2.0 and Asp.net 2.0 only.

I have set target framework to 2.0 for all of my Libraries and web projects. It complies without any error!

However, when site opens in IE (Set to default.aspx), it gives me error as below:

InternalXmlHelper.vb(9) : error BC30560: 'ExtensionAttribute' is ambiguous in the namespace 'System.Runtime.CompilerServices'.

What needs to be done in this case, could anyone guide me.

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