Developing a billing system is one of the most common projects for VB.NET developers, and with good reason—it's the perfect way to master database integration, user interface design, and business logic implementation.
CREATE TABLE Customers ( CustomerID INT IDENTITY(1,1) PRIMARY KEY, CustomerName VARCHAR(100) NOT NULL, Phone VARCHAR(20), TotalBalance DECIMAL(18,2) DEFAULT 0.00 ); CREATE TABLE Products ( ProductID INT IDENTITY(1,1) PRIMARY KEY, ProductName VARCHAR(100) NOT NULL, Price DECIMAL(18,2) NOT NULL, StockQuantity INT NOT NULL ); CREATE TABLE Invoices ( InvoiceNo INT IDENTITY(1001,1) PRIMARY KEY, InvoiceDate DATETIME DEFAULT GETDATE(), CustomerID INT FOREIGN KEY REFERENCES Customers(CustomerID), GrossAmount DECIMAL(18,2), TaxAmount DECIMAL(18,2), NetAmount DECIMAL(18,2) ); CREATE TABLE InvoiceDetails ( ID INT IDENTITY(1,1) PRIMARY KEY, InvoiceNo INT FOREIGN KEY REFERENCES Invoices(InvoiceNo), ProductID INT FOREIGN KEY REFERENCES Products(ProductID), Quantity INT NOT NULL, UnitPrice DECIMAL(18,2) NOT NULL, TotalPrice DECIMAL(18,2) NOT NULL ); Use code with caution. 2. Database Connection Wrapper Module
Private Sub btnAddToCart_Click(sender As Object, e As EventArgs) Handles btnAddToCart.Click If cmbProductName.SelectedValue Is Nothing Then MessageBox.Show("Please select a product") Return End If
Replace the code in your main form with the fully integrated backend implementation below. Make sure to adjust the connString variable to match your database server configuration. vb.net billing software source code
: Bind the txtProductID.TextChanged or KeyPress events to match barcode lookup sequences, removing manual typing dependencies.
Download a sample project, set up the SQL tables, step through the SaveInvoice() function with breakpoints, and watch how a bill moves from the cart to the database. That hands-on experience is worth more than any pre-packaged solution.
Avoid raw inline string queries like "SELECT * FROM Users WHERE ID = " + txtInput.Text . This application enforces SQL parameter mapping bindings ( @InvNo , @ProdID ), which completely neutralizes SQL injection vulnerabilities. If you need to extend this source code, let me know: Developing a billing system is one of the
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This should give you a starting point for creating a simple billing software in VB.NET. Expand on this by adding more features as needed.
This repository provides a complete point-of-sale system designed for shops, built entirely with VB.NET. The project includes SQL database scripts for easy setup. Download a sample project, set up the SQL
' Execute a query Dim cmd As New OleDbCommand("SELECT * FROM Products", conn) Dim reader As OleDbDataReader = cmd.ExecuteReader()
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