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C # System.guid does not contain definition for Parse

AT.Anchor = System.Guid.Parse(DataBinder.Eval(e.Item.DataItem, "Anchor").ToString());

It throws:

'System.Guid' does not contain a definition for 'Parse'

When I try to build it. But it works fine, any idea how I can handle this better?

Edit

Here is the section of my web.config

    <compilation defaultLanguage="c#" debug="true">
        <assemblies>
            <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
            <add assembly="System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.ApplicationServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="MySql.Data, Version=6.3.6.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
            <add assembly="MySql.Data.Entity, Version=6.3.6.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
            <add assembly="MySql.Web, Version=6.3.6.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/></assemblies>
    </compilation>
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2 answers

Guid.TryParse is part of .NET 4. Make sure you both create and run .NET 4, and that should be fine.

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One of the things about IIS application pools is that the first web application that runs in the application pool determines the version of the CLR used by this application pool.

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