private void FillMappList()
        {
            objServicedb = new ServiceDB();
            char      cMapped = 'T';
            Hashtable ht      = new Hashtable();
            DataSet   ds      = new DataSet();

            lbMapp.DataSource = null;
            try
            {
                if (chkMapp.CheckState == CheckState.Unchecked)
                {
                    cMapped     = 'F';
                    lblMap.Text = "Unmapped Source";
                }
                else
                {
                    lblMap.Text = "Mapped Source";
                }

                DataTable dt = objServicedb.GetMapOrUnmappedEcodes(CommonData.CompanyCode, CommonData.BranchCode, CommonData.DocMonth, cMapped).Tables[0];
                if (dt.Rows.Count > 1)
                {
                    lbMapp.DisplayMember = "ENAME";
                    lbMapp.ValueMember   = "ECODE";
                    lbMapp.DataSource    = dt;
                }
                dt = null;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                objServicedb = null;
            }
        }