//Selecciona el Nro. del Documento
 public void fu_car_nro()
 {
     try
     {
         c_adm005  objTal = new c_adm005();
         DataTable dt_tal = objTal._01(tb_fec_cha.Value.Year, Convert.ToInt16(cb_num_tal.SelectedValue), "CMP");
         if (dt_tal.Rows.Count == 0)
         {
             MessageBoxEx.Show("Talonario en la Gestio NO encontrada", "Error");
         }
         else
         {
             tb_nro_doc.Text = (Convert.ToInt32(((DataRow)dt_tal.Rows[0])["va_con_tad"]) + 1).ToString();
         }
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }