private void btnDisplay_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         if (Customer.EditValue == null)
         {
             MessageBox.Show("You must Choose Customer", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
             return;
         }
         DataTable dt = CustomerManager.GetCustomerStatement(Customer.EditValue.ToString(), null, null, out Customer_Debit, out Customer_Credit);
         CustomerStatementGrid.DataSource = dt;
         CustomerStatementGrid.DataMember = dt.TableName;
         CustomerDebit.Caption            = Customer_Debit.ToString();
         CustomerCredit.Caption           = Customer_Credit.ToString();
         CustomerBalance.Caption          = (Customer_Debit - Customer_Credit).ToString();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }
 private void btnPeriodDisplay_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         if (Customer.EditValue == null)
         {
             MessageBox.Show("You must Choose Customer", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
             return;
         }
         else if (DateFrom.EditValue == null)
         {
             MessageBox.Show("You must Choose From Date", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
             return;
         }
         else if (DateTo.EditValue == null)
         {
             MessageBox.Show("You must Choose To Date", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
             return;
         }
         else if ((DateTime)DateFrom.EditValue > (DateTime)DateTo.EditValue)
         {
             MessageBox.Show("From Date must be Less than Or Equal To Date", "Stop", MessageBoxButtons.OK, MessageBoxIcon.Stop);
             return;
         }
         DataTable dt = CustomerManager.GetCustomerStatement(Customer.EditValue.ToString(), (DateTime)DateFrom.EditValue, (DateTime)DateTo.EditValue, out Customer_Debit, out Customer_Credit);
         CustomerStatementGrid.DataSource = dt;
         CustomerStatementGrid.DataMember = dt.TableName;
         CustomerDebit.Caption            = Customer_Debit.ToString();
         CustomerCredit.Caption           = Customer_Credit.ToString();
         CustomerBalance.Caption          = (Customer_Debit - Customer_Credit).ToString();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }