title: How to solve ajaxcontroltoolkit.extendercontrolbase.dispose() error?
body: <p>I am working on an application in which ajaxcntroltoolkit is used.This control is added on a usercontrol whose top code is</p>
  
  <pre><code>&lt;%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxtoolkit" %&gt;
  
  &lt;asp:ScriptManager ID="sm" runat="server" /&gt;
  </code></pre>
  
  <p>This user control is added on an aspx page and this page is inherited from a master page.
  When control goes to master page error is shown as</p>
  
  <p>Locating source for 'f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs'. Checksum: MD5 {ee 1a 1d c3 d5 ca a 7d 84 6b 74 7f 51 e8 63 6b}</p>
  
  <p><img src="https://i.stack.imgur.com/aNeyh.png" alt="enter image description here"></p>
  
  <p>How to solve this error i have tried using latest version of ajaxcontroltoolkit but same error exists.</p>