Vb.net Billing Software Source Code (2026)

Private Sub LoadCustomers() Try Dim query As String = "SELECT CustomerID, CustomerName FROM Customers" DBConnection.OpenConnection() Dim adapter As New SqlDataAdapter(query, DBConnection.conn) Dim dt As New DataTable() adapter.Fill(dt) cmbCustomer.DataSource = dt cmbCustomer.DisplayMember = "CustomerName" cmbCustomer.ValueMember = "CustomerID" DBConnection.CloseConnection() Catch ex As Exception MessageBox.Show("Error loading customers: " & ex.Message) End Try End Sub

offset += 15graphic.DrawString("-----------------------------------------------------------------", fontNormal, Brushes.Black, startX, startY + offset)offset += 20graphic.DrawString("Gross Subtotal: $" & txtGrossTotal.Text, fontNormal, Brushes.Black, startX + 200, startY + offset)offset += 20graphic.DrawString("Tax Amount: $" & txtTax.Text, fontNormal, Brushes.Black, startX + 200, startY + offset)offset += 20graphic.DrawString("Net Amount Due: $" & txtNetTotal.Text, fontBold, Brushes.Black, startX + 200, startY + offset)End SubEnd Class

End Class

Try ' Create a StreamWriter to write text to the file Using writer As New StreamWriter(filePath, False) ' False to overwrite existing file writer.WriteLine("================================") writer.WriteLine(" OFFICIAL INVOICE ") writer.WriteLine("================================") writer.WriteLine("Date: " & invoiceDate) writer.WriteLine("Customer: " & customerName) writer.WriteLine("--------------------------------") ' If using a DataGridView for items, loop through rows here writer.WriteLine("Total Amount Due: $" & totalAmount) writer.WriteLine("--------------------------------") writer.WriteLine(" Thank you for your business! ") writer.WriteLine("================================") End Using vb.net billing software source code

A production-grade billing application requires a structured, multi-tier data flow to ensure transaction data remains accurate and secure. This implementation covers:

Imports System.Data.SqlClient

: A DataGridView ( dgvInvoiceItems ) with columns: Product ID , Product Code , Product Name , Unit Price , Quantity , and Subtotal . Private Sub LoadCustomers() Try Dim query As String

Modules to store customer details (name, contact) and inventory levels with shorthand notations.

A reliable billing application depends on a structured relational database. For this system, we use four primary tables to track products, manage customers, and store invoice metadata along with line-item details. Database Schema (MS Access / SQL Server) Table: Products Stores inventory data, item codes, and pricing models. ProductID (AutoNumber, Primary Key) ProductCode (Text, Unique) – For barcode scanning. ProductName (Text) Price (Currency) Stocks (Integer) Table: Customers

Building a Visual Basic .NET Billing System: Architecture, Core Components, and Source Code Modules to store customer details (name, contact) and

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.

This code snippet handles adding items to the DataGridView and calculating the subtotal.

Private Sub PrintDocument_PrintPage(sender As Object, e As Printing.PrintPageEventArgs) Dim font As New Font("Arial", 10) Dim titleFont As New Font("Arial", 14, FontStyle.Bold) Dim yPos As Single = 50 Dim leftMargin As Single = 50 Dim xPos As Single = leftMargin

✅ Product Management (Add, View) ✅ Customer Management ✅ Shopping Cart functionality ✅ GST calculation ✅ Invoice generation ✅ Print receipt ✅ Transaction management ✅ Basic reporting structure