Could not load file or assembly 'ABC.dll, Version=5.5.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies
<p>We have an C# class library project which was created using .Net framework 3.5.In that C# project we add an assembly ABC.dll build using VS 2008 3.5 framework with version 5.5.0.0.
Now when we add ABC.dll with an updated version of 6.6.2.1 then in Designer view still get an error:</p>

<blockquote>
  <p>Could not load file or assembly 'ABC.dll, Version=5.5.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.</p>
</blockquote>

<p>I am really stuck and cannot find the reason in-spite of adding 6.6.2.1 why the project is asking for 5.5.0.0 version dll?</p>

<p>We are now using C# Express Edition 2010 to open the project.</p>
