Create the database abstraction layers to handle data connectivity cleanly.
' Insert Invoice Dim invoiceQuery As String = "INSERT INTO Invoices (InvoiceNumber, CustomerID, InvoiceDate, SubTotal, GSTAmount, TotalAmount, PaymentMethod, Status) VALUES (@InvoiceNo, @CustomerID, @Date, @SubTotal, @GST, @Total, @PaymentMethod, 'Completed') SELECT SCOPE_IDENTITY()"
Using cmd As New SqlCommand(invoiceQuery, DBConnection.conn, transaction) cmd.Parameters.AddWithValue("@InvoiceNo", txtInvoiceNo.Text) cmd.Parameters.AddWithValue("@CustomerID", Convert.ToInt32(cmbCustomer.SelectedValue)) cmd.Parameters.AddWithValue("@Date", DateTime.Now) cmd.Parameters.AddWithValue("@SubTotal", subtotal) cmd.Parameters.AddWithValue("@GST", totalGST) cmd.Parameters.AddWithValue("@Total", totalAmount) cmd.Parameters.AddWithValue("@PaymentMethod", cmbPaymentMethod.Text)
The "vb.net billing software source code" is not just a collection of files; it is a blueprint for understanding transactional systems, database integrity, and UI/UX in desktop applications. By mastering the code patterns shown above—database transactions, DataGridView cart management, and dynamic printing—you can build a billing system that rivals commercial products.
Using a stored procedure is a best practice for database-driven applications. Instead of sending multiple individual SQL queries from your VB.NET code (e.g., one to update the card table, one for the student table, and one for the recharge table), you can create a single stored procedure on the database server that executes all three updates in one go. The VB.NET code simply calls the stored procedure, which reduces network traffic, improves performance, and centralizes business logic for better security and maintenance. vb.net billing software source code
-- Invoice Header CREATE TABLE tbl_Invoice ( InvoiceNo INT PRIMARY KEY IDENTITY(1,1), InvoiceDate DATETIME DEFAULT GETDATE(), CustomerID INT FOREIGN KEY REFERENCES tbl_Customer(CustomerID), SubTotal DECIMAL(18,2), GST_Amount DECIMAL(18,2), GrandTotal DECIMAL(18,2), PaymentMode NVARCHAR(20) -- Cash/Card/UPI );
Before opening any code, ensure you have the necessary software installed. This typically includes:
Track customer profiles and billing history.
Public Function SaveBill(customerID As Integer, dtCart As DataTable, paymentMode As String) As Boolean Using transaction As SqlTransaction = con.BeginTransaction() Try ' 1. Insert into tbl_Invoice Dim cmdHeader As New SqlCommand("INSERT INTO tbl_Invoice (InvoiceDate, CustomerID, SubTotal, GST_Amount, GrandTotal, PaymentMode) OUTPUT INSERTED.InvoiceNo VALUES (@date, @cust, @sub, @gst, @grand, @mode)", con, transaction) ' ... add parameters from calculated totals ... Dim newInvoiceNo As Integer = Convert.ToInt32(cmdHeader.ExecuteScalar()) ' 2. Insert each row into tbl_InvoiceDetails & reduce stock For Each row As DataGridViewRow In dtCart.Rows ' Insert details Dim cmdDetail As New SqlCommand("INSERT INTO tbl_InvoiceDetails (InvoiceNo, ProductID, Quantity, Price, GST_Percent, LineTotal) VALUES (@invNo, @pid, @qty, @price, @gst, @lineTotal)", con, transaction) ' ... add parameters ... Create the database abstraction layers to handle data
End Class
Developing a robust billing and invoicing system is a foundational requirement for many retail, wholesale, and service-based businesses. Visual Basic .NET (VB.NET) combined with Windows Forms (WinForms) and ADO.NET remains a highly efficient, reliable choice for building desktop-based database applications. Its rapid application development capabilities allow you to create clean user interfaces and seamless data connections quickly.
| Aspect | Building from Source Code | Buying Commercial Software | | :--- | :--- | :--- | | | Low (only your time) | High (license fees) | | Customization | Unlimited | Limited to software features | | Time | 2–4 weeks for a stable version | Immediate | | Maintenance | You are responsible | Vendor support | | Learning | High (great for students) | None |
TextBox for Customer Name, DateTimePicker for Invoice Date, and a read-only TextBox for Invoice ID. Using a stored procedure is a best practice
Private Sub PrintBill(invoiceNo As Integer) Dim printDoc As New Printing.PrintDocument() AddHandler printDoc.PrintPage, Sub(sender, e) Dim yPos As Single = 50 Dim font As New Font("Courier New", 10) e.Graphics.DrawString("ABC STORES - GST BILL", New Font(font, FontStyle.Bold), Brushes.Black, 100, yPos) yPos += 30 e.Graphics.DrawString($"Invoice #: invoiceNo Date: Date.Now", font, Brushes.Black, 50, yPos) yPos += 30 ' ... loop through DataGridView and print each line ... End Sub printDoc.Print() End Sub
Developing a robust billing and invoicing system is a foundational requirement for many enterprise applications. Visual Basic .NET (VB.NET) combined with Windows Forms (WinForms) and a relational database provides a reliable, rapid-development ecosystem for creating desktop-based point-of-sale (POS) and invoicing solutions.
To keep our code clean and maintainable, we will create a dedicated database configuration module. This class handles opening connections and executing standard data tasks safely. Add a new class to your project named DbConnection.vb :
' Fire printing subprocess initialization routinePrintInvoiceReceipt()ResetInvoiceForm()
: We use parameterized queries ( cmd.Parameters.AddWithValue ) for writing operational details. This ensures malicious string injections are treated strictly as data literals rather than executable commands.