模板列绑定ImageButton，弹出窗口 提示“是”“否”

private void dgClass_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
ImageButton Ibtn =(ImageButton)e.Item.FindControl("ImageButton1");
Ibtn .Attributes.Add("onclick","return confirm('XXX');");
}
} 

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
    if(e.Item.ItemIndex>-1)
    {
    ImageButton btn = e.Item.FindControl("ImageButton1") as ImageButton;
    btn.Attributes.Add("onclick","return confirm('???');");
   }
}

if(e.CommandSource.ToString()=="System.Web.UI.WebControls.ImageButton")
 {
 int iID = CGlbFunction.GetInt32FromString(((Label)e.Item.FindControl("J04_ID")).Text.ToString());
 int iRowCount = this.myDataSetSubShift.Tables[0].Rows.Count;
        
for (int i =0; i< iRowCount; i++)
 {
 if (iID == (int)this.myDataSetSubShift.Tables[0].Rows[i]["J04_ID"])  {  //如果找到行
           ImageButton Ibtn =(ImageButton)e.Item.FindControl("ImageButton1"); 
   Ibtn .Attributes.Add("onclick","return confirm('删除，继续么？');");
            //其它执行代码
           break; //跳出循环
  }
 }
           
}