Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click If txtProductName.Text = "" Or txtPrice.Text = "" Then MessageBox.Show("Please enter product details.") Exit Sub End If Dim qty As Integer = Val(txtQty.Text) Dim price As Double = Val(txtPrice.Text) Dim subTotal As Double = qty * price ' Add row to DataGridView dgvInvoice.Rows.Add(txtProductName.Text, price, qty, subTotal) ' Update Grand Total CalculateTotal() ClearInputs() End Sub Use code with caution. 3. Calculating the Final Bill
Elias just smiled, knowing that beneath the buttons and labels lay thousands of lines of source code
' Update Grand Total Label CalculateGrandTotal() End If End Sub
Here is the essential relational schema consisting of three primary tables: , Invoices , and InvoiceDetails .
Here is how the core components are structured within a Visual Studio project. A. Database Connection Class ( DBConnection.vb ) vbnet+billing+software+source+code
Using open-source source code is an excellent way to learn or jumpstart a project. Here is a typical workflow:
A DataGridView ( dgvInvoiceItems ) displaying columns: Code, Product Name, Price, Quantity, Total.
Generating structured transaction records and compiling them into clean formats like PDF, Excel, or thermal printer outputs. 2. Relational Database Design (SQL)
Provides a quick overview of daily sales, total bills, top-selling products, and revenue insights. B. Product & Inventory Management Organize products. Private Sub btnAdd_Click(sender As Object, e As EventArgs)
Building a Retail Billing Software in VB.NET: A Complete Guide with Source Code
tbl_Customers (1) ----< (N) tbl_Invoices (1) ----< (N) tbl_InvoiceItems >---- (1) tbl_Products
CREATE TABLE tbl_Users ( UserID INT PRIMARY KEY IDENTITY(1,1), Username NVARCHAR(50) NOT NULL, Password NVARCHAR(50) NOT NULL, Role NVARCHAR(20) NOT NULL -- Admin / Cashier );
: Handheld USB barcode scanners mimic keyboard input devices. By setting the form properties to monitor keystrokes, you can capture scanner inputs directly into txtProductID and programmatically trigger the data grid additions. Here is how the core components are structured
Reports are generated using parameters passed to a Crystal Report or Microsoft Report Viewer. The system generates:
: Set the txtProductCode control to auto-focus after every transaction. Barcode scanners automatically append a carriage return ( Enter key), which natively activates the transaction processing routine within txtProductCode_KeyDown .
' Example: Calculating total on DataGridView Cell End Edit Private Sub dgvCart_CellEndEdit(sender As Object, e As DataGridViewCellEventArgs) Handles dgvCart.CellEndEdit If e.ColumnIndex = dgvCart.Columns("Quantity").Index Then Dim qty As Integer = CInt(dgvCart.Rows(e.RowIndex).Cells("Quantity").Value) Dim price As Decimal = CDec(dgvCart.Rows(e.RowIndex).Cells("Price").Value)
Add a PrintDocument control and its PrintPage event.