Imports System.Data.SqlClient Module DatabaseConnection Public conn As New SqlConnection("Data Source=SERVERNAME;Initial Catalog=BillingDB;Integrated Security=True") Public Sub OpenConnection() If conn.State = ConnectionState.Closed Then conn.Open() End If End Sub End Module Use code with caution. Saving an Invoice
CRUD operations (Create, Read, Update, Delete) for items. vbnet+billing+software+source+code
Real-time calculation of subtotals, taxes (GST/VAT), and discounts. Imports System
Support for VAT, GST, or sales tax calculations based on regional requirements. Ability to apply percentage-based or flat-rate discounts. D. Reporting and Analytics Daily, monthly, and yearly sales reports. Top-selling products analysis. Sample Code Structure (Simplified) and discounts. Support for VAT