title: ReferenceError: Can't find variable: WebForm_DoPostBackWithOptions
body: <p>I'm having the strangest issue with iPhones / Droids / iPads on an ASP.NET Webforms Login page.</p>
  
  <p>Everything is working, the username/password Javascript validation triggers everything... When the user pushes Submit, the page simply times out for a very long time, and this error appears.  I'm not sure if this is some strange JS / Back-end / etc type of issue!</p>
  
  <blockquote>
    <p>ReferenceError: Can't find variable: WebForm_DoPostBackWithOptions</p>
  </blockquote>
  
  <p>On the button itself, the generated code from ASP.NET is:</p>
  
  <pre><code>href='javascript:WebForm_DoPostBackWithOptions(new 
      WebForm_PostBackOptions("ctl00$MainContent$btnSubmit", "", true, 
      "LoginUserValidationGroup", "", false, true))'
  </code></pre>
  
  <p>As for the Back-end the event doesn't do anything special besides Login validation!</p>
  
  <pre><code>Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSubmit.Click
      ' Check U/Password etc...
  End Sub
  </code></pre>
  
  <p>Has anyone run into this issue before??</p>