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Most open-source VB.NET billing projects include these standard modules:

Microsoft Access Database Engine installed on the host machine [1]. 🗄️ Step 1: Database Setup

Dim qty As Decimal = Convert.ToDecimal(nudQty.Value) Dim price As Decimal = Convert.ToDecimal(txtPrice.Text) Dim amount As Decimal = qty * price

A robust billing system is defined by its core functionalities, which you can assemble from available source code: