Creating a comprehensive billing software source code in VB.NET for a full application is quite extensive and complex for a single response. However, I can guide you through a basic example of how to structure a simple billing system. This example will include basic functionalities such as adding items, calculating subtotal, tax, and total.
Private Sub btnReports_Click(sender As Object, e As EventArgs) Handles btnReports.Click Dim reports As New frmReports() reports.ShowDialog() End Sub
While classic WinForms is stable, you can modernize your billing app:
You can find various free and open-source project templates on community platforms: Super-market-Billing-System-using-VB.net - GitHub