title: .Net assembly version mismatch
body: <p>After a few check-ins and auto merges (on TFS) of an ASP .NET Web App, I have an assembly version mismatch:</p>
  
  <blockquote>
    <p>Assembly 'Telerik.Web.UI, Version=2009.3.1314.35, Culture=neutral,
    PublicKeyToken=121fae78165ba3d4' <strong>uses 'System.Web.Extensions,
    Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
    which has a higher version than referenced assembly
    'System.Web.Extensions, Version=1.0.61025.0</strong>, Culture=neutral,
    PublicKeyToken=31bf3856ad364e35'</p>
  </blockquote>
  
  <p>Apparently, this means I should reference System.Web.Extensions version 3.5.0.0 instead of 1.0.61025.0.</p>
  
  <p>I've removed and added the references to both assemblies multiple times, I've made sure there's no 1.0.61025.0 in the Web.config, I've also scanned the bin folder for anything that looks like System.Web.Extensions, but I can't find anything.</p>
  
  <p>What am I missing?</p>