title: Difference between ToolsVersion and TargetFrameworkVersion
body: <p>What is the difference between <em>ToolsVersion</em> and <em>TargetFrameworkVersion</em>?</p>
  
  <pre><code>&lt;Project DefaultTargets="Build"  ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"&gt;
    &lt;PropertyGroup&gt;
     ......  
      &lt;TargetFrameworkVersion&gt;v4.5&lt;/TargetFrameworkVersion&gt;
  </code></pre>