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Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

I have been installing all my projects from a source control application on my new laptop.
Since everything is new, it is difficult to install everything in the right order without missing one.
In one of my projects, when I built the solution I got the following error message.

Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

pointing to the web.config file where the following reference is registered.

<add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>


This error is actually pointing that I have been using ASP.NET AJAX 1.0 in this solution and I have not installed the ASP.NET AJAX 1.0 on the new computer.

If you have a similar problem you can download and install it from Microsoft ASP.NET AJAX 1.0 Download page.

Published Tuesday, February 17, 2009 2:18 PM
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SQL Server administrator and T-SQL developer including BI components Web programming with HTML, HTML5 and ASP, ASP.NET and .NET Framework developer SAP ABAP and SAPUI5 development, Web Dynpro and Smart Form Siemens HiPath Center CTI development
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