GRIDVIEW模板取列值问题..求救

代码：  protected void GridView_RowCommand(object sender, GridViewCommandEventArgs e)
    {
       
        
        if (e.CommandName == "delete")
        {

           //取得到id
           int index = int.Parse(e.CommandArgument.ToString());

  //filename总是取空 （问题在这）        

 string filename = ((HyperLink)GvWebhard.Rows[index].FindControl("HyperLink1")).Text.ToString();
           
            string path = "Mr" + "//" + filename;

            FileInfo fi = new FileInfo(Server.MapPath(path));
           
            if (fi.Exists)//确定文件是否存在 
            {
                fi.Delete();//删除文件 
            }


            directory.SqlDelete(Convert.ToInt32(e.CommandArgument.ToString()));
            bind(Convert.ToInt32(DDLName.SelectedValue));
           
            Response.Write("<script>alert('删除数据成功！！');</script>");

        }
        
    }

补充：.NET技术 ,  ASP.NET