title: FileNotFoundException in ApplicationSettingsBase
body: <p>When debugging an application I always get the following error when break on exception is enabled in Visual Studio. This is really bugging me, since we work with break on exception. The funny thing is, that it still works when I continue (the StringCollection is loaded).</p>
  <p>The Message is:</p>
  <blockquote>
  <p>Could not load file or assembly 'System.XmlSerializers,
  Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or
  one of its dependencies. The system cannot find the file specified.</p>
  </blockquote>
  <p>Here is the code that is causing the exception (designer generated)</p>
  <pre><code>[global::System.Configuration.UserScopedSettingAttribute()]
  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
  public global::System.Collections.Specialized.StringCollection Mru {
          get {
              return ((global::System.Collections.Specialized.StringCollection)(this[&quot;Mru&quot;]));
          }
          set {
              this[&quot;Mru&quot;] = value;
          }
      }
  </code></pre>
  <p>I tried to create an empty test application that shows the error, but the exception didn't occur. Our project is huge so it tough to find the cause. Maybe someone on this site has a clue how to solve this.</p>