Public Class BillingSystem ' Function to calculate total amount Public Function CalculateTotal(price As Double, qty As Integer, taxRate As Double) As Double Dim subTotal As Double = price * qty Dim taxAmount As Double = subTotal * (taxRate / 100) Return subTotal + taxAmount End Function ' Example usage in a Button Click event Private Sub btnGenerate_Click(sender As Object, e As EventArgs) Handles btnGenerate.Click Dim price As Double = CDbl(txtPrice.Text) Dim qty As Integer = CInt(txtQuantity.Text) Dim tax As Double = 5.0 ' Fixed 5% tax Dim finalTotal = CalculateTotal(price, qty, tax) lblTotal.Text = "Total: $" & finalTotal.ToString("N2") End Sub End Class Use code with caution. Copied to clipboard Key Components of Billing Software
: Protects sensitive financial data through user logins and role-based permissions. 3. Technical Architecture vbnet+billing+software+source+code
: The core logic that calculates totals, taxes (like GST), and discounts in real-time. Public Class BillingSystem ' Function to calculate total
Imports System.Data.SqlClient Module DbConnection Public con As New SqlConnection("Data Source=YOUR_SERVER;Initial Catalog=BillingDB;Integrated Security=True") Public Sub OpenConnection() If con.State = ConnectionState.Closed Then con.Open() End Sub End Module Use code with caution. Copied to clipboard 4. Essential Logic: Adding Items to a Bill Technical Architecture : The core logic that calculates