protected void gvItems_RowDataBound(object sender, GridViewRowEventArgs e)        {            string sql = "select * from table";            Datalb db = new Datalb();            DataSet ds = db.Sql_s(sql);            //DropDownList ddl = (DropDownList)e.Row.FindControl("DropDownList1");                       if (e.Row.RowType == DataControlRowType.DataRow)            {              //  DropDownList DropDownList1 = (DropDownList)e.Row.FindControl("DropDownList1") as DropDownList;                DropDownList ddl = e.Row.FindControl("DropDownList1") as DropDownList;                if (ddl!=null)                {                    ddl.DataSource = ds.Tables[0].DefaultView;                    ddl.DataTextField = "content";                    ddl.DataValueField = "id";                    ddl.DataBind();                }                           }