The internet is filled with code repositories, but knowing where to look can save you countless hours of sifting through incomplete or low-quality projects. Here are the most reliable sources to find functional and well-structured VB.NET billing source code.
End Class
Public Sub New(invoiceID As Integer, customerID As Integer, invoiceDate As Date, totalAmount As Decimal) Me.invoiceID = invoiceID Me.customerID = customerID Me.invoiceDate = invoiceDate Me.totalAmount = totalAmount End Sub
| Table | Purpose | | :--- | :--- | | | Store login credentials and access levels | | Products | Product information including name, price, stock quantity, and category | | Customers | Customer profile data including contact information | | Categories | Product categorization for organization | | Invoices | Master record of each transaction—date, customer ID, total amount | | Invoice_Items | Line items for each invoice—product ID, quantity, unit price, subtotal | | Settings | System-wide settings including tax rates, company information |
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TextBox ( txtProdCode ) for barcode scans or manual code entries. ComboBox/TextBox ( txtProdName ) for product discovery. TextBox ( txtPrice ) for displaying the base item cost. TextBox ( txtQty ) for entering the purchase quantity. Button ( btnAddToCart ) to push line items into the grid.
The VB.NET billing software is a comprehensive application that offers a range of features to help businesses manage their billing processes. Some of the key features of the software include:
| Aspect | Building from Source Code | Buying Commercial Software | | :--- | :--- | :--- | | | Low (only your time) | High (license fees) | | Customization | Unlimited | Limited to software features | | Time | 2–4 weeks for a stable version | Immediate | | Maintenance | You are responsible | Vendor support | | Learning | High (great for students) | None |
Imports System.Data.SqlClient
Storing all historical data securely. 2. Setting Up the Database
In the late 1990s and early 2000s, a quiet revolution took place in back-offices and small retail shops. It was the era of the Rapid Application Development (RAD)
' A typical snippet in the "C_Total" class Public Function GetAmount(price As Double, quantity As Integer) As Double Dim subtotal As Double = price * quantity Dim tax As Double = subtotal * 0.15 ' The classic 15% VAT logic Return subtotal + tax End Function Use code with caution. Copied to clipboard
A modern billing system in VB.NET is built using the .NET framework, typically leveraging Windows Forms (WinForms) for the desktop interface and either SQL Server The internet is filled with code repositories, but
Create a module mod_DB.vb to centralize your connection string:
Private Sub LoadCustomers() Try Dim query As String = "SELECT CustomerID, CustomerName FROM Customers" DBConnection.OpenConnection() Dim adapter As New SqlDataAdapter(query, DBConnection.conn) Dim dt As New DataTable() adapter.Fill(dt) cmbCustomer.DataSource = dt cmbCustomer.DisplayMember = "CustomerName" cmbCustomer.ValueMember = "CustomerID" DBConnection.CloseConnection() Catch ex As Exception MessageBox.Show("Error loading customers: " & ex.Message) End Try End Sub
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.
Modules to store customer details (name, contact) and inventory levels with shorthand notations. This link or copies made by others cannot be deleted
Using standard VB.NET arithmetic functions to eliminate manual calculation errors.
Most VB.NET billing systems follow a standard desktop application structure: