title: System.MissingMethodException: Method not found?
body: <p>Previous working asp.net webforms app now throws this error:</p>
  <blockquote>
  <p>System.MissingMethodException: Method not found</p>
  </blockquote>
  <p>The <code>DoThis</code> method is on the same class and it should work.</p>
  <p>I have a generic handler as such:</p>
  <pre><code>public class MyHandler: IHttpHandler
  {
      public void Processrequest(HttpContext context)
      {
        // throws error now System.MissingMethodException: 
        // Method not found.
        this.DoThis(); 
      }
  
      public void DoThis(){ ... }
  }
  </code></pre>