title: 0x800a1391 - JavaScript runtime error: 'Page_ClientValidate' is undefined
body: <p>My button click seems to generating this error on submission.....Dont understand quite why since i've used this exact button setup a few times already...</p>
  
  <p><img src="https://i.stack.imgur.com/1MGjv.png" alt="enter image description here"></p>
  
  <p>This is the original button code before click</p>
  
  <pre><code>asp:Button ID="btnSubmit" runat="server" Text="Submit" BorderWidth="1px" Font-Bold="True" Height="27px" Width="117px" OnClick="btnSubmit_Click"  UseSubmitBehavior="false" OnClientClick="this.value = 'Please wait...'; if(Page_ClientValidate()) { this.disabled = true; } else {this.value = 'Submit'; return false;}" /&gt; 
  </code></pre>
  
  <p>This is what happens to it after click</p>
  
  <p><img src="https://i.stack.imgur.com/xTNBp.png" alt="enter image description here"></p>
  
  <p>these are the files i'm referencing in the script</p>
  
  <pre><code>&lt;script src="~/Scripts/jquery-1.8.2.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script src="~/Scripts/jquery-1.4.2.min.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;script src="~/Scripts/jquery-ui-1.10.3.custom.min.js" type="text/javascript"&gt;&lt;/script&gt;
  &lt;link href="~/Styles/css/ui-lightness/jquery-ui-1.10.3.custom.css" rel="stylesheet" type="text/css" /&gt;
  &lt;script src="~/Scripts/jquery-1.9.1.js" type="text/javascript"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Any help would be greatly appreciated....don't quite know if i'm overlooking something</p>