Imports System.Data.SqlClient Public Class dbConfig Public conn As New SqlConnection("Data Source=YOUR_SERVER;Initial Catalog=BillingDB;Integrated Security=True") Public Sub OpenConnection() If conn.State = ConnectionState.Closed Then conn.Open() End Sub Public Sub CloseConnection() If conn.State = ConnectionState.Open Then conn.Close() End Sub End Class Use code with caution. 4. Designing the Billing UI Your main form ( frmBilling.vb ) should include: Product ID, Quantity, Price, Customer Name. DataGridView: To display the current items in the cart. Buttons: "Add to Cart", "Generate Invoice", "Clear". 5. Core Logic: Adding Items to Grid
Use libraries like iTextSharp to export the DataGridView content into a PDF invoice. vb.net billing software source code
Below is a comprehensive guide and a modular breakdown of the source code for a standard Desktop Billing Application. 1. Project Prerequisites Imports System
A secure login form to restrict access to the billing module. Conclusion DataGridView: To display the current items in the cart