In the quiet hum of the "Old Port General Store," sat behind a cluttered desk, his eyes reflecting the blue glow of a cathode-ray monitor. He wasn't just a shopkeeper; he was a self-taught architect of logic. For years, the store’s billing was a mess of carbon-copy receipts and manual tallies that never quite added up. Tired of the chaos, Elias opened a new project in Visual Studio
' Insert into tbl_InvoiceDetails For Each row As DataRow In cartTable.Rows Dim productID As Integer = Convert.ToInt32(row("ProductID")) Dim qty As Integer = Convert.ToInt32(row("Quantity")) Dim price As Decimal = Convert.ToDecimal(row("Price")) Dim gstAmt As Decimal = Convert.ToDecimal(row("GST_Amount")) Dim total As Decimal = Convert.ToDecimal(row("Total")) vbnet+billing+software+source+code
Public Class frmInvoice Private dtDetails As New DataTable() In the quiet hum of the "Old Port
ItemID , InvoiceID , ProductID , Quantity , Price . 3. Core Module: Database Connection Tired of the chaos, Elias opened a new
End Module
Private Sub CalculateTotal() Dim runningSum As Double = 0 For Each row As DataGridViewRow In dgvInvoice.Rows runningSum += Convert.ToDouble(row.Cells(3).Value) Next Dim taxAmount As Double = runningSum * taxRate Dim finalBill As Double = runningSum + taxAmount lblSubtotal.Text = runningSum.ToString("C2") lblTax.Text = taxAmount.ToString("C2") lblGrandTotal.Text = finalBill.ToString("C2") End Sub Use code with caution. Database Integration (ADO.NET)
Dim query As String = "INSERT INTO tbl_Products (ProductCode, ProductName, Rate, GST_Percent) VALUES (@code, @name, @rate, @gst)" Dim params() As SqlParameter = New SqlParameter("@code", txtCode.Text), New SqlParameter("@name", txtProductName.Text), New SqlParameter("@rate", CDec(txtRate.Text)), New SqlParameter("@gst", CDec(txtGST.Text))