Vb.net Billing Software Source Code =link= < 2026 >

A robust billing system must handle multiple, distinct tasks. When looking at or creating source code, these are the essential modules to include: A. Customer Management Module

Websites like SourceCodester and TechRooms are also excellent resources. These sites often feature well-documented projects with step-by-step installation guides. One prime example is the Automated Beer Parlour Billing System available on SourceCodester. This project, developed using VB.NET and MS Access, is a complete billing solution that includes login modules, POS transaction capabilities, and sales receipt generation. The same project, often referred to as the Pub Billing System , can also be found on sites like TechRooms, where the author encourages users to download and modify the source code to improve their programming skills. A more recent example from 2024 is a Food POS system on GitHub that uses Visual Studio 2019 and includes an audit trail and report generation.

Should the billing system support or manual lookup?

If you go hunting for source code on platforms like CodeProject, GitHub, or CodeCanyon, don’t just download the first zip file you see. Look for these critical features to ensure the code is modern and maintainable: vb.net billing software source code

Once the database connection is configured, simply click the "Start" button (or press the F5 key) in Visual Studio. The project will compile and run, allowing you to log in with the default credentials (often provided in the project's README.md file) and start exploring its features.

Searching for "VB.NET Billing System" will yield many open-source projects.

Do you need to include like VAT or GST? Share public link A robust billing system must handle multiple, distinct tasks

: Design print layouts to stream hardcopy billing receipts instantly through commercial thermal POS systems.

-- 1. Products Table CREATE TABLE Products ( ProductID INT PRIMARY KEY IDENTITY(1) NOT NULL, ProductName VARCHAR(100) NOT NULL, Price DECIMAL(18, 2) NOT NULL, StockQuantity INT NOT NULL ); -- 2. Invoices Table CREATE TABLE Invoices ( InvoiceID INT PRIMARY KEY IDENTITY(1) NOT NULL, InvoiceDate DATETIME DEFAULT GETDATE() NOT NULL, CustomerName VARCHAR(100) NULL, TotalAmount DECIMAL(18, 2) NOT NULL, TaxAmount DECIMAL(18, 2) NOT NULL, GrandTotal DECIMAL(18, 2) NOT NULL ); -- 3. Invoice Items Table (Transaction Details) CREATE TABLE InvoiceItems ( ItemID INT PRIMARY KEY IDENTITY(1) NOT NULL, InvoiceID INT FOREIGN KEY REFERENCES Invoices(InvoiceID) NOT NULL, ProductID INT FOREIGN KEY REFERENCES Products(ProductID) NOT NULL, Quantity INT NOT NULL, UnitPrice DECIMAL(18, 2) NOT NULL, SubTotal DECIMAL(18, 2) NOT NULL ); Use code with caution. 💻 Complete VB.NET Billing Software Source Code

Imports System.Data.SqlClient Public Sub SaveInvoice(customerID As Integer, totalAmount As Decimal) Dim connString As String = "YourConnectionStringHere" Using conn As New SqlConnection(connString) Dim query As String = "INSERT INTO Invoices (CustomerID, InvoiceDate, TotalAmount) VALUES (@CustID, @Date, @Total)" Using cmd As New SqlCommand(query, conn) cmd.Parameters.AddWithValue("@CustID", customerID) cmd.Parameters.AddWithValue("@Date", DateTime.Now) cmd.Parameters.AddWithValue("@Total", totalAmount) conn.Open() cmd.ExecuteNonQuery() End Using End Using End Sub Use code with caution. 4. Best Practices for Billing Software Development The same project, often referred to as the

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: txtCustomerName , txtProductID , txtQuantity , txtPrice , txtProductName Labels : lblGrandTotal , lblTax , lblSubTotal

Imports System.Data.SqlClient Imports System.Configuration Public Class frmBilling ' Define the connection string (Modify security parameters as needed for production) Private ReadOnly connString As String = "Server=(localdb)\MSSQLLocalDB;Database=BillingDB;Trusted_Connection=True;" ' Temporary runtime storage for the selected Product's ID Private currentProductID As Integer = 0 ''' ''' Form Load event. Initializes structural components. ''' Private Sub frmBilling_Load(sender As Object, e As EventArgs) Handles MyBase.Load InitializeInvoiceGrid() LoadCustomers() GenerateInvoiceNumber() ResetProductInputs() End Sub ''' ''' Explicitly creates columns for the DataGridView to avoid structural mismatch. ''' Private Sub InitializeInvoiceGrid() With dgvItems .Columns.Clear() .Columns.Add("ProductID", "Product ID") .Columns.Add("ProductCode", "Item Code") .Columns.Add("ProductName", "Item Description") .Columns.Add("UnitPrice", "Unit Price") .Columns.Add("Quantity", "Qty") .Columns.Add("LineTotal", "Total Amount") ' UI Optimization .Columns("ProductID").Visible = False .Columns("ProductName").AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill .SelectionMode = DataGridViewSelectionMode.FullRowSelect .AllowUserToAddRows = False End With End Sub ''' ''' Hydrates the Customer dropdown selection. ''' Private Sub LoadCustomers() Dim query As String = "SELECT CustomerID, CustomerName FROM Customers" Using conn As New SqlConnection(connString) Using cmd As New SqlCommand(query, conn) Dim dt As New DataTable() Try conn.Open() Using reader As SqlDataReader = cmd.ExecuteReader() dt.Load(reader) End Using cmbCustomer.DataSource = dt cmbCustomer.DisplayMember = "CustomerName" cmbCustomer.ValueMember = "CustomerID" Catch ex As Exception MessageBox.Show($"Database Error loading customers: ex.Message", "DAL Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try End Using End Using End Sub ''' ''' Generates a unique, trackable string sequence for the current transaction instance. ''' Private Sub GenerateInvoiceNumber() Dim timestamp As String = DateTime.Now.ToString("yyyyMMddHHmmss") txtInvoiceNumber.Text = $"INV-timestamp" End Sub ''' ''' Fires when a product code is entered or scanned via barcode reader. ''' Private Sub txtProductCode_KeyDown(sender As Object, e As KeyEventArgs) Handles txtProductCode.KeyDown If e.KeyCode = Keys.Enter Then e.SuppressKeyPress = True ' Stop systemic beep sound on enter If String.IsNullOrWhiteSpace(txtProductCode.Text) Then Exit Sub Dim query As String = "SELECT ProductID, ProductName, UnitPrice FROM Products WHERE ProductCode = @ProductCode" Using conn As New SqlConnection(connString) Using cmd As New SqlCommand(query, conn) cmd.Parameters.AddWithValue("@ProductCode", txtProductCode.Text.Trim()) Try conn.Open() Using reader As SqlDataReader = cmd.ExecuteReader() If reader.Read() Then currentProductID = Convert.ToInt32(reader("ProductID")) txtProductName.Text = reader("ProductName").ToString() txtUnitPrice.Text = Convert.ToDecimal(reader("UnitPrice")).ToString("F2") txtQuantity.Focus() Else MessageBox.Show("Product not found in system storage.", "Inventory Check", MessageBoxButtons.OK, MessageBoxIcon.Warning) ResetProductInputs() End If End Using Catch ex As Exception MessageBox.Show($"Error pulling inventory details: ex.Message", "Query Error", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try End Using End Using End If End Sub ''' ''' Validates UI input state and appends entry record to active item grid list. ''' Private Sub btnAddToGrid_Click(sender As Object, e As EventArgs) Handles btnAddToGrid.Click If currentProductID = 0 OrElse String.IsNullOrWhiteSpace(txtProductName.Text) Then MessageBox.Show("Please select or scan a valid product first.", "Input Missing", MessageBoxButtons.OK, MessageBoxIcon.Warning) Exit Sub End If Dim qty As Integer If Not Integer.TryParse(txtQuantity.Text, qty) OrElse qty <= 0 Then MessageBox.Show("Please input a valid positive integer quantity.", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Warning) Exit Sub End If Dim price As Decimal = Convert.ToDecimal(txtUnitPrice.Text) Dim total As Decimal = price * qty ' Append items directly to the UI Matrix dgvItems.Rows.Add(currentProductID, txtProductCode.Text, txtProductName.Text, price, qty, total) CalculateInvoiceTotals() ResetProductInputs() End Sub ''' ''' Iterates grid data records to maintain computational totals real-time. ''' Private Sub CalculateInvoiceTotals() Dim subTotal As Decimal = 0 For Each row As DataGridViewRow In dgvItems.Rows If Not row.IsNewRow Then subTotal += Convert.ToDecimal(row.Cells("LineTotal").Value) End If Next Dim taxRate As Decimal = 0 Decimal.TryParse(txtTaxRate.Text, taxRate) Dim taxAmount As Decimal = subTotal * (taxRate / 100) Dim grandTotal As Decimal = subTotal + taxAmount lblSubTotal.Text = subTotal.ToString("F2") lblTaxAmount.Text = taxAmount.ToString("F2") lblGrandTotal.Text = grandTotal.ToString("F2") End Sub Private Sub txtTaxRate_TextChanged(sender As Object, e As EventArgs) Handles txtTaxRate.TextChanged CalculateInvoiceTotals() End Sub Private Sub ResetProductInputs() currentProductID = 0 txtProductCode.Clear() txtProductName.Clear() txtUnitPrice.Clear() txtQuantity.Text = "1" txtProductCode.Focus() End Sub ''' ''' Implements an ACID-compliant transaction workflow to save both master and detail layers. ''' Private Sub btnSavePrint_Click(sender As Object, e As EventArgs) Handles btnSavePrint.Click If dgvItems.Rows.Count = 0 Then MessageBox.Show("Cannot process an empty billing statement.", "Validation Halt", MessageBoxButtons.OK, MessageBoxIcon.Warning) Exit Sub End If Using conn As New SqlConnection(connString) conn.Open() ' Initialize SQL transaction pipeline for reliable multi-table commitment Using sqlTran As SqlTransaction = conn.BeginTransaction() Dim masterQuery As String = "INSERT INTO Invoices (InvoiceNumber, CustomerID, SubTotal, TaxRate, TaxAmount, GrandTotal) " & "VALUES (@InvNum, @CustID, @Sub, @TaxR, @TaxA, @Grand); SELECT SCOPE_IDENTITY();" Dim detailQuery As String = "INSERT INTO InvoiceDetails (InvoiceID, ProductID, Quantity, UnitPrice) " & "VALUES (@InvID, @ProdID, @Qty, @Price);" Dim stockQuery As String = "UPDATE Products SET StockQuantity = StockQuantity - @Qty WHERE ProductID = @ProdID" Try Dim newInvoiceID As Integer = 0 ' 1. Persist Master Record Using cmdMaster As New SqlCommand(masterQuery, conn, sqlTran) cmdMaster.Parameters.AddWithValue("@InvNum", txtInvoiceNumber.Text.Trim()) cmdMaster.Parameters.AddWithValue("@CustID", cmbCustomer.SelectedValue) cmdMaster.Parameters.AddWithValue("@Sub", Convert.ToDecimal(lblSubTotal.Text)) cmdMaster.Parameters.AddWithValue("@TaxR", Convert.ToDecimal(If(String.IsNullOrEmpty(txtTaxRate.Text), "0", txtTaxRate.Text))) cmdMaster.Parameters.AddWithValue("@TaxA", Convert.ToDecimal(lblTaxAmount.Text)) cmdMaster.Parameters.AddWithValue("@Grand", Convert.ToDecimal(lblGrandTotal.Text)) newInvoiceID = Convert.ToInt32(cmdMaster.ExecuteScalar()) End Using ' 2. Loop & Persist Line Items + Adjust Inventory Stock levels For Each row As DataGridViewRow In dgvItems.Rows Dim pID As Integer = Convert.ToInt32(row.Cells("ProductID").Value) Dim qty As Integer = Convert.ToInt32(row.Cells("Quantity").Value) Dim uPrice As Decimal = Convert.ToDecimal(row.Cells("UnitPrice").Value) ' Insert details record Using cmdDetail As New SqlCommand(detailQuery, conn, sqlTran) cmdDetail.Parameters.AddWithValue("@InvID", newInvoiceID) cmdDetail.Parameters.AddWithValue("@ProdID", pID) cmdDetail.Parameters.AddWithValue("@Qty", qty) cmdDetail.Parameters.AddWithValue("@Price", uPrice) cmdDetail.ExecuteNonQuery() End Using ' Deduct Stock allocation Using cmdStock As New SqlCommand(stockQuery, conn, sqlTran) cmdStock.Parameters.AddWithValue("@Qty", qty) cmdStock.Parameters.AddWithValue("@ProdID", pID) cmdStock.ExecuteNonQuery() End Using Next ' All stages complete without failure flags sqlTran.Commit() MessageBox.Show($"Invoice txtInvoiceNumber.Text successfully committed to ledger.", "Transaction Success", MessageBoxButtons.OK, MessageBoxIcon.Information) ClearFormToDefault() Catch ex As Exception ' Error encountered, roll state back to prevent fragmented/orphaned logs sqlTran.Rollback() MessageBox.Show($"Critical Database Transaction Exception: ex.Message", "Transaction Rollback Executed", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try End Using End Using End Sub Private Sub ClearFormToDefault() dgvItems.Rows.Clear() lblSubTotal.Text = "0.00" lblTaxAmount.Text = "0.00" lblGrandTotal.Text = "0.00" txtTaxRate.Text = "0" GenerateInvoiceNumber() ResetProductInputs() End Sub End Class Use code with caution. Technical Analysis of the Code 1. Database Transaction Security (ACID Principles)

A professional billing system is more than just a calculator; it is an integrated tool for managing a business. The best VB.NET source code projects are modular, meaning they are broken down into distinct, manageable sections that each handle a specific business function. This modular design not only makes the code easier to understand and maintain but also aligns with modern software design principles.

What do you plan to use for your application?