public void FillListbox(ListBox lBox, string Qry)
    {
       try
        {
            DataTable dt = GetDatatable(Qry);
            lBox.Items.Clear();
            if (dt.Rows.Count > 0)
            {
                lBox.DataSource = dt;
                lBox.DataTextField = dt.Columns[1].ToString();
                lBox.DataValueField = dt.Columns[0].ToString();
                lBox.DataBind();
                lBox.SelectedIndex = 0;
            }
        }catch (Exception ex)
        {
            throw ex;
        }

    }