title: How to disable the CheckBox in the GridView Header?
body: <p><img src="https://i.stack.imgur.com/U0PbG.jpg" alt="GridView"></p>
  
  <p>In this GridView, I want to disable all the CheckBox in the GridView during the View Mode.
  I can disable the GridView Row cells like </p>
  
  <pre><code>foreach (GridViewRow GVR in gvPODetails.Rows)
      {
          GVR.Cells[1].Enabled =          
          GVR.Cells[11].Enabled = false;
      }
  </code></pre>
  
  <p>But I dont know how to disable the checkbox in the HeaderTemplate of the Template Field. How to do this?</p>