title: Add Get Variable (QueryString) into PostBackUrl in FormView asp.net
body: <p>I have following code:</p>
  
  <pre><code>&lt;asp:Button ID="InsertButton" runat="server" CausesValidation="True" 
                                      CommandName="Insert" Text="Add Form" 
               PostBackUrl="~/APPLICATION/FormView.aspx?postquestion="/&gt;   
  </code></pre>
  
  <p>I using FormView Control.</p>
  
  <p>I need to add Request.QueryString["postquestion"] variable into "FormView.aspx?postquestion=" for PostBackUrl. </p>
  
  <p>I found following code on net, however it's not working:</p>
  
  <pre><code>PostBackUrl='&lt;%# ="~/APPLICATION/FormView.aspx?postquestion=" + Request.QueryString  ["postquestion"].ToString() %&gt;'
  </code></pre>
  
  <p>Thanks for help!</p>