because of the access right to folder~but thank you all the same~ 

I have met the problem before,I solve by:

 cliend side: 
               <Columns>
                <ISWebGrid:WebGridColumn Name="Checker"  IsRowChecker="true" >
            </ISWebGrid:WebGridColumn>
      ...................
                       </Columns>

server side:
protected void Button1_Click(object sender, EventArgs e)
        {     
          
            TextBox1.Text = "checked rows : \n";
            foreach (string keyValue in WebGrid1.RootTable.GetCheckedRows())
            {

                TextBox1.Text += WebGrid1.RootTable.Rows.GetRowByKeyValue(keyValue).Position + " ; \n";//current rowIndex                    
  
            }
        }

how can I fix  the bug in WebUI 2009 ?

Is there any patch for downLoad?

I has rosolved the question!

the problen has been resolved !

but thank you all the same!