Pageindex is not work properly
<p>i try in button control:</p>

<pre><code>protected void btnImgBack_Click(object sender,EventArgs e)
 {
   try
   {
     gdvFile.DataSource = GetFiles();
     gdvFile.DataBind();
     gdvFile.PageIndex=1;
   }
   catch(Exception ex)
   {
     throw ex;
   }
 }
</code></pre>

<p>If <code>btnImgBack</code> is click i want to go back in page 1 of grid .But instead of going page 1 i am in same page.<code>PageIndex</code> is not work for this or i mistake some thing else?Thanks.</p>
