title: Access<asp:FormView> field value from code behind.
body: <p>I have am using an asp:FormView control with elements such as: </p>
  
  <pre><code>&lt;asp:TextBox id="FirstName" 
  runat="server" MaxLength="20" 
  Columns="15" Text='&lt;%# Bind("FirstName") %&gt;' /&gt;
  </code></pre>
  
  <p>I cannot access the value of this field by its id -> "FirstName" in the code behind file.</p>
  
  <p>Any ideas on how I can access that value in the code behind file?</p>