MessageBox.Show("Bill saved successfully! Bill No: " & billID) currentBillID = billID btnPrint.Enabled = True End Sub
Private Function SaveBillHeader(custID As Integer, subtotal As Decimal, tax As Decimal, discount As Decimal, grand As Decimal) As Integer Dim query As String = "INSERT INTO Bills (BillDate, CustomerID, Subtotal, TaxAmount, DiscountAmount, GrandTotal) VALUES (@date, @cid, @sub, @tax, @dis, @grand); SELECT SCOPE_IDENTITY()" Using conn As New OleDbConnection(connString) Dim cmd As New OleDbCommand(query, conn) cmd.Parameters.AddWithValue("@date", DateTime.Now) cmd.Parameters.AddWithValue("@cid", custID) cmd.Parameters.AddWithValue("@sub", subtotal) cmd.Parameters.AddWithValue("@tax", tax) cmd.Parameters.AddWithValue("@dis", discount) cmd.Parameters.AddWithValue("@grand", grand) conn.Open() Return CInt(cmd.ExecuteScalar()) End Using End Function
Private Sub btnPrint_Click(sender As Object, e As EventArgs) Handles btnPrint.Click If currentBillID = -1 Then MessageBox.Show("Save the bill first.") Return End If Dim rpt As New frmPrintPreview(currentBillID) rpt.ShowDialog() End Sub