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Asked: 2026-05-15T17:33:32+00:00

I have an application in asp.net2.0 with C#. I have migrated my application in

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I have an application in asp.net2.0 with C#. I have migrated my application in .NET 3.5 & I am receiving the below error.

Could not load file or assembly 'Microsoft.Build.Framework' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

Please let me know how I can solve this.

Thanks in advance.

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1 Answer

  1. Editorial Team

    in the web.config

    in the assemblies place the right versions – or remove Microsoft.Build.Framework

    <compilation ... >
      <assemblies>
...
      </assemblies>

    Here is my assemblies for 3.5 project.

            <assemblies>
            <add assembly="System.Management, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Configuration.Install, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.OracleClient, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Messaging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="System.Core, 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.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.Linq, 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.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/></assemblies>

    You can also create a new empty project and see what he makes on your web.config and by compare the new to the old, fix the old one by just keeping your values.

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