A comprehensive billing system built in VB.NET generally consists of the following modules and code structures: 1. Database Schema (MS SQL/MySQL) The backbone of the application. Key tables include: Users : Authentication and roles. Products/Items : Item ID, Name, Price, Stock Quantity. Customers : Customer details for invoicing.
' Generic method to execute Non-Query (Insert, Update, Delete) Public Function ExecuteNonQuery(query As String, parameters As List(Of SqlParameter)) As Boolean Using conn As SqlConnection = GetConnection() Using cmd As New SqlCommand(query, conn) If parameters IsNot Nothing Then cmd.Parameters.AddRange(parameters.ToArray()) End If conn.Open() Dim rowsAffected As Integer = cmd.ExecuteNonQuery() Return rowsAffected > 0 End Using End Using End Function End Class
Here is a conceptual breakdown of the code involved in a billing transaction. Database Connection (ADO.NET)
Transitioning this template to a reliable, commercial-grade ecosystem involves implementing the following modules:
In this post, I’ll walk you through the key components of a typical billing software project in VB.NET and share source code snippets you can build upon. vbnet+billing+software+source+code
: Tracks daily sales, tax collections, and stock alerts. Database Schema (SQL Server)
One of the main benefits of working with source code is the ability to modify it. These projects are primarily meant for and serve as excellent templates. You can download them for free, learn from them, and modify the source code to meet your specific business requirements. If you need to customize the code for your own project, you can use an editor like Visual Studio or Visual Studio Code .
Create an MS Access database named BillingDB.accdb [1]. Create the following two core tables to handle inventory management and invoicing. Table 1: Products This table stores the store's current inventory [1]. Field Name Description ProductID AutoNumber Primary Key ProductName Short Text Name of the item Price Unit price Stock Available quantity Table 2: InvoiceDetails
' 2. Insert Items and Update Stock For Each item In items ' Insert Item Using cmd As New SqlCommand(queryItem, conn, transaction) cmd.Parameters.AddWithValue("@IID", invoiceId) cmd.Parameters.AddWithValue("@PID", item.ProductID) cmd.Parameters.AddWithValue("@Qty", item.Quantity) cmd.Parameters.AddWithValue("@Price", item.UnitPrice) cmd.ExecuteNonQuery() End Using A comprehensive billing system built in VB
Private Sub UpdateTotal(amount As Double) totalBill += amount lblGrandTotal.Text = "Total: $" & totalBill.ToString("N2") End Sub
While there are many resources for , the query "vbnet+billing+software+source+code" could refer to a few different things depending on what you're looking for:
Design a form featuring text boxes for client data, dropdown elements for selecting stock items, a DataGridView named dgvInvoice , and action buttons to calculate and save. Paste this complete execution code into your form:
Developing a custom desktop billing application is an excellent project for mastering Visual Basic .NET (VB.NET) and Windows Forms (WinForms). This guide provides a step-by-step walkthrough to build a retail billing system using VB.NET and an MS Access database (.accdb) [1, 2]. 🏗️ Architecture and Prerequisites Products/Items : Item ID, Name, Price, Stock Quantity
' Business Logic: Calculate total price for a quantity Public Function CalculateTotal(qty As Integer) As Decimal Return Price * qty End Function End Class
As businesses automate their financial operations, VB.NET billing software remains a popular, practical solution. Its accessibility and the vast resources available make it a top choice for developers and business owners.
Imports System.Data.SqlClient Public Class frmBilling ' Temporary runtime table to hold UI cart entries before database commitment Dim cartTable As New DataTable Private Sub frmBilling_Load(sender As Object, e As EventArgs) Handles MyBase.Load InitializeCart() LoadProducts() txtDate.Text = DateTime.Now.ToString("yyyy-MM-dd") End Sub Private Sub InitializeCart() cartTable.Columns.Add("ProductID", GetType(Integer)) cartTable.Columns.Add("Product Name", GetType(String)) cartTable.Columns.Add("Unit Price", GetType(Decimal)) cartTable.Columns.Add("Qty", GetType(Integer)) cartTable.Columns.Add("Total", GetType(Decimal)) dgvInvoice.DataSource = cartTable ' Optimize column layouts for user readability dgvInvoice.Columns("ProductID").Visible = False dgvInvoice.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill End Sub Private Sub LoadProducts() Using conn As SqlConnection = GetConnection() If conn Is Nothing Then Exit Sub Dim cmd As New SqlCommand("SELECT ProductID, ProductName, Price FROM Products", conn) Dim adapter As New SqlDataAdapter(cmd) Dim dt As New DataTable() adapter.Fill(dt) cboProducts.DataSource = dt cboProducts.DisplayMember = "ProductName" cboProducts.ValueMember = "ProductID" End Using End Sub ' Update price box when item choice switches Private Sub cboProducts_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboProducts.SelectedIndexChanged If TypeOf cboProducts.SelectedValue Is DataRowView Then Exit Sub Using conn As SqlConnection = GetConnection() If conn Is Nothing OrElse Not IsNumeric(cboProducts.SelectedValue) Then Exit Sub Dim cmd As New SqlCommand("SELECT Price FROM Products WHERE ProductID = @ID", conn) cmd.Parameters.AddWithValue("@ID", cboProducts.SelectedValue) Dim price As Object = cmd.ExecuteScalar() If price IsNot Nothing Then txtUnitPrice.Text = Convert.ToDecimal(price).ToString("0.00") End If End Using End Sub ' Push validated item data into runtime memory cart grid Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click If String.IsNullOrEmpty(txtQty.Text) OrElse Not IsNumeric(txtQty.Text) Then MsgBox("Please enter a valid quantity.", MsgBoxStyle.Exclamation, "Validation") Exit Sub End If Dim prodID As Integer = Convert.ToInt32(cboProducts.SelectedValue) Dim prodName As String = cboProducts.Text Dim price As Decimal = Convert.ToDecimal(txtUnitPrice.Text) Dim qty As Integer = Convert.ToInt32(txtQty.Text) Dim total As Decimal = price * qty ' Check if product already exists in cart, update qty if it does Dim existingRow As DataRow() = cartTable.Select("ProductID = " & prodID) If existingRow.Length > 0 Then existingRow(0)("Qty") += qty existingRow(0)("Total") = Convert.ToDecimal(existingRow(0)("Qty")) * price Else cartTable.Rows.Add(prodID, prodName, price, qty, total) End If CalculateInvoiceTotals() txtQty.Clear() End Sub Private Sub CalculateInvoiceTotals() Dim subTotal As Decimal = 0 For Each row As DataRow In cartTable.Rows subTotal += Convert.ToDecimal(row("Total")) For Next Dim taxRate As Decimal = If(IsNumeric(txtTaxRate.Text), Convert.ToDecimal(txtTaxRate.Text), 0D) Dim taxAmount As Decimal = subTotal * (taxRate / 100) Dim grandTotal As Decimal = subTotal + taxAmount txtSubTotal.Text = subTotal.ToString("0.00") txtTaxAmount.Text = taxAmount.ToString("0.00") txtGrandTotal.Text = grandTotal.ToString("0.00") End Sub Private Sub txtTaxRate_TextChanged(sender As Object, e As EventArgs) Handles txtTaxRate.TextChanged CalculateInvoiceTotals() End Sub ' Commit transactions natively across standard tables Private Sub btnSaveInvoice_Click(sender As Object, e As EventArgs) Handles btnSaveInvoice.Click If cartTable.Rows.Count = 0 Then MsgBox("Cart is empty. Cannot save invoice.", MsgBoxStyle.Exclamation, "Validation") Exit Sub End If Using conn As SqlConnection = GetConnection() If conn Is Nothing Then Exit Sub ' Open explicit SQL transaction handler for system safety scope Dim transaction As SqlTransaction = conn.BeginTransaction() Try ' 1. Insert Master Records Dim cmdInvoice As New SqlCommand( "INSERT INTO Invoices (CustomerID, SubTotal, TaxRate, TaxAmount, GrandTotal) " & "VALUES (@CustID, @Sub, @TaxR, @TaxAmt, @Grand); SELECT SCOPE_IDENTITY();", conn, transaction) ' Defaulting safely to Customer ID 1 for walk-ins if empty cmdInvoice.Parameters.AddWithValue("@CustID", 1) cmdInvoice.Parameters.AddWithValue("@Sub", Convert.ToDecimal(txtSubTotal.Text)) cmdInvoice.Parameters.AddWithValue("@TaxR", Convert.ToDecimal(txtTaxRate.Text)) cmdInvoice.Parameters.AddWithValue("@TaxAmt", Convert.ToDecimal(txtTaxAmount.Text)) cmdInvoice.Parameters.AddWithValue("@Grand", Convert.ToDecimal(txtGrandTotal.Text)) Dim newInvoiceID As Integer = Convert.ToInt32(cmdInvoice.ExecuteScalar()) ' 2. Loop & Write Detailed Line Items + Deduct Warehouse Quantities For Each row As DataRow In cartTable.Rows Dim cmdItem As New SqlCommand( "INSERT INTO InvoiceItems (InvoiceID, ProductID, Quantity, UnitPrice, LineTotal) " & "VALUES (@InvID, @ProdID, @Qty, @Price, @LineTotal)", conn, transaction) cmdItem.Parameters.AddWithValue("@InvID", newInvoiceID) cmdItem.Parameters.AddWithValue("@ProdID", row("ProductID")) cmdItem.Parameters.AddWithValue("@Qty", row("Qty")) cmdItem.Parameters.AddWithValue("@Price", row("Unit Price")) cmdItem.Parameters.AddWithValue("@LineTotal", row("Total")) cmdItem.ExecuteNonQuery() ' Deducting Inventory Stock Quantities Dim cmdStock As New SqlCommand( "UPDATE Products SET StockQuantity = StockQuantity - @Qty WHERE ProductID = @ProdID", conn, transaction) cmdStock.Parameters.AddWithValue("@Qty", row("Qty")) cmdStock.Parameters.AddWithValue("@ProdID", row("ProductID")) cmdStock.ExecuteNonQuery() Next transaction.Commit() MsgBox("Invoice #" & newInvoiceID & " successfully generated and saved!", MsgBoxStyle.Information, "Success") ClearForm() Catch ex As Exception transaction.Rollback() MsgBox("Transaction processing failed. Structural rollback applied." & vbCrLf & ex.Message, MsgBoxStyle.Critical, "Error") End Try End Using End Sub Private Sub ClearForm() cartTable.Rows.Clear() txtSubTotal.Clear() txtTaxAmount.Clear() txtGrandTotal.Clear() txtTaxRate.Text = "0" End Sub End Class Use code with caution. Security & Optimization Best Practices
Create a new in Visual Studio, choose VB.NET as the language, and implement the modules below. 1. Database Connection Module ( dbConnection.vb )
The drag-and-drop interface of Visual Studio makes designing forms (UI) fast and efficient.
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