title: GridView_RowCommand event fired again on page refresh
body: <p>I have implement GridView Row Editing feature in my .net application using <code>&lt;asp:CommandField</code>.
  I clicked on Update button to save the record after editing the row.Now if i refresh the page or press F5 GridView_RowCommand fired again.</p>
  
  <p>How can we avoid this.Is there any mechanism to identify when user press F5 OR refresh the page.Is there any method in client side or in server side.</p>