DataGrid中点击某行,弹出对话,取出ID

1 protected void DataGrid1_ItemDataBound(object sender, DataGridItemEventArgs e)
2 {        
3     if (e.Item.ItemIndex >= 0)
4     {           
5      e.Item.Attributes["onClick"] = "javascript:alert(DataGrid1.row["+(e.Item.ItemIndex+1)+"].cells[0].innerText);";       
6     }          
7 }