CalculateTotal()

Here’s an interesting, slightly opinionated review of — written from the perspective of a developer or small business owner evaluating such a solution.

Imports System.Data.SqlClient

In the modern business landscape, efficient management of sales and inventory is critical. Manual billing processes are prone to human error, difficult to audit, and lack real-time reporting capabilities. While complex Enterprise Resource Planning (ERP) systems exist, they are often too expensive or complex for small businesses.

Building a billing system in VB.NET generally involves creating a user interface (UI) to input items, a backend logic to calculate totals, and a method to display or print the final invoice. Core Logic Example

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-- 1. Customers Table CREATE TABLE Customers ( CustomerID INT IDENTITY(1,1) PRIMARY KEY, CustomerName VARCHAR(150) NOT NULL, Phone VARCHAR(20), Email VARCHAR(100), Address VARCHAR(250) ); -- 2. Products Table CREATE TABLE Products ( ProductID INT IDENTITY(1,1) PRIMARY KEY, ProductName VARCHAR(150) NOT NULL, Price DECIMAL(18,2) NOT NULL, StockQuantity INT NOT NULL ); -- 3. Invoice Master Table CREATE TABLE Invoices ( InvoiceID INT IDENTITY(1,1) PRIMARY KEY, InvoiceDate DATETIME DEFAULT GETDATE(), CustomerID INT FOREIGN KEY REFERENCES Customers(CustomerID), SubTotal DECIMAL(18,2), TaxRate DECIMAL(5,2), TaxAmount DECIMAL(18,2), GrandTotal DECIMAL(18,2) ); -- 4. Invoice Items (Details) Table CREATE TABLE InvoiceItems ( InvoiceItemID INT IDENTITY(1,1) PRIMARY KEY, InvoiceID INT FOREIGN KEY REFERENCES Invoices(InvoiceID) ON DELETE CASCADE, ProductID INT FOREIGN KEY REFERENCES Products(ProductID), Quantity INT NOT NULL, UnitPrice DECIMAL(18,2) NOT NULL, LineTotal DECIMAL(18,2) NOT NULL ); Use code with caution. Core Implementation Source Code

✅ – You can reskin and deploy quickly. Charge for customizations.

Never store plain passwords in production. Use SHA256 hashing.

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 .

While newer frameworks exist, VB.NET remains a favorite for rapid application development (RAD) in desktop environments. Its drag-and-drop interface in Visual Studio allows you to build complex forms—like a checkout counter—in a fraction of the time it takes in other languages. Conclusion

Secure authentication using salt-hash (simplified here for demo).

Developing billing software in VB.NET is an excellent way to build a functional, efficient, and scalable solution for businesses of all sizes. This guide provides a complete resource for anyone looking to download, modify, or understand VB.NET billing software source code.

To be functional, a basic billing system needs these essential modules: Inventory Management: Add, update, and track stock levels. Customer Records: Maintain a database of client contact details. Invoice Generation: Calculate totals, taxes, and discounts in real-time. Print Functionality:

Private Sub PrintInvoice(ByVal invNo As String) ' Build invoice text Dim sb As New System.Text.StringBuilder() sb.AppendLine(" MY BILLING SOFTWARE ") sb.AppendLine("--------------------------") sb.AppendLine($"Invoice No: invNo") sb.AppendLine($"Date: DateTime.Now") sb.AppendLine("--------------------------") sb.AppendLine("Item Qty Price Total") For Each row As DataRow In cartTable.Rows sb.AppendLine($"row("ProductName") row("Quantity") row("Price") row("Total")") Next sb.AppendLine("--------------------------") sb.AppendLine($"Grand Total: lblGrandTotal.Text") sb.AppendLine("--------------------------") sb.AppendLine(" Thank you! ")

To maintain clean code, separate database connection strings and execution commands from the UI logic. Create a helper class named dbConnection.vb .

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