private void cboStores_EditValueChanged(object sender, EventArgs e) { if (cboStores.EditValue == null) { return; } var iss = new IssueDoc(); var dtRec = iss.GetDistinctIssueDocments(Convert.ToInt32(cboStores.EditValue)); lstTree.DataSource = dtRec; DateTime dt1 = EthiopianDate.EthiopianDate.Now.StartOfFiscalYear.ToGregorianDate(); DateTime dt2 = DateTime.Now; dtRec = iss.GetTransactionByDateRange(Convert.ToInt32(cboStores.EditValue), dt1, dt2); lblIssDate.Text = @"Current Year"; gridIssues.DataSource = dtRec; }