Vb.net Billing Software Source Code Upd

Finding source code for a VB.NET billing system is common for both learning and rapid development. Most open-source projects for this purpose use a combination of Visual Studio for the UI, SQL Server or MS Access for data storage, and Crystal Reports for generating invoices. Popular Open-Source VB.NET Billing Repositories

You can find well-documented source code on platforms like GitHub and SourceForge:

Retail & Grocery Billing: A desktop application specifically for supermarkets using MS Access via OLEDB connection.

Sales & Inventory Management: A more robust system using SQL Server that handles products, categories, purchase orders, and sales reports.

Simple Billing System: A lightweight application using SQLite 3 for basic stock management and customer billing.

Specialized Systems: Specific projects exist for niche needs, such as Medical Store Management, Electricity Billing, and Restaurant Billing. Core Features typically included: Super-market-Billing-System-using-VB.net - GitHub vb.net billing software source code

Building a billing software in is an excellent choice for desktop-based business applications because it combines a human-readable syntax with the high-performance capabilities of the .NET ecosystem If you are looking for source code

to jumpstart your project, here are some top repositories and resources you can explore today: 1. Top Open-Source VB.NET Billing Repositories Supermarket Billing System

: A desktop application specifically for grocery stores that uses an MS Access database via OLEDB connections. MedicTouch Pharmacy System

: A medical store management tool focused on record-keeping and computerized bill entry. Simple Billing System (GitHub)

: A functional point-of-sale project built using Visual Studio 2010 or newer. Billing System with SQLite Finding source code for a VB

: A project that integrates SQLite 3, making it a great option if you need a lightweight, standalone database. Sourcecodester VB Projects

: Offers specialized source code for various industries, such as a dedicated Water Billing System designed for complex payment requirements. 2. Essential Features to Include A robust VB.NET billing system should typically feature: How to create a Billing System Project in Visual Basic.Net

4.1 SQL Injection Vulnerability

The most critical finding is the construction of SQL queries via string concatenation.

Example Found:

Dim query As String = "SELECT * FROM Invoices WHERE InvoiceID = " & txtInvoiceID.Text

Risk: This leaves the application wide open to SQL Injection attacks. A user could input malicious SQL into the text box to drop tables or access unauthorized data. Risk: This leaves the application wide open to

The Customization Advantage

The real power of having the source code is the ability to tweak it. No off-the-shelf software understands your business like you do.

  • Custom Tax Logic: Do you have a complex tax structure based on location? You can hardcode that logic directly into the CalculateTotal() function.
  • Branding: You can completely redesign the UI to match your company colors, creating a professional look that impresses clients.
  • Integration: Want to send an SMS alert when an invoice is overdue? Because you have the backend code, you can easily plug in an SMS API—a feature usually reserved for expensive "Enterprise" tiers of SaaS software.

8. Conclusion: Is VB.NET Still Viable?

Yes, for internal business tools and standalone billing apps.
Modern alternatives include C# WPF, .NET MAUI, or web-based systems, but VB.NET wins for:

  • Simple deployment (single EXE + database file).
  • Low learning curve for small business developers.
  • Legacy hardware support (thermal printers, POS terminals).

The source code patterns above are production-ready but must be extended with:

  • Error logging (log4net or EventLog)
  • Invoice cancellation (with refund entry, not deletion)
  • GSTR-1 / GSTR-3B export (CSV/JSON)

If you need the complete source code (all forms, full database script, and reports) for a specific use case (retail shop, restaurant, pharmacy), let me know – I can provide a detailed GitHub-ready structure with all files.

3. The Billing Engine – Calculating Invoice Totals

Inside your frmBillEntry.vb:

Private Sub CalculateTotals()
    Dim subtotal As Decimal = 0
    Dim totalTax As Decimal = 0
    Dim discountAmt As Decimal = 0
    Dim grandTotal As Decimal = 0

For Each row As DataGridViewRow In dgvBill.Rows
    If row.IsNewRow Then Continue For
    Dim amount As Decimal = Convert.ToDecimal(row.Cells("Amount").Value)
    subtotal += amount
' Assume GST is stored per product
    Dim gstPercent As Decimal = Convert.ToDecimal(row.Cells("GSTPercent").Value)
    Dim lineAmount As Decimal = Convert.ToDecimal(row.Cells("Amount").Value)
    totalTax += (lineAmount * gstPercent / 100)
Next
discountAmt = subtotal * (Convert.ToDecimal(txtDiscountPercent.Text) / 100)
grandTotal = subtotal - discountAmt + totalTax
lblSubtotal.Text = subtotal.ToString("N2")
lblTax.Text = totalTax.ToString("N2")
lblDiscount.Text = discountAmt.ToString("N2")
lblGrandTotal.Text = grandTotal.ToString("N2")



End Sub

Recommendation

  • Refactor towards an n-Tier architecture.
  • Implement the Model-View-Presenter (MVP) or MVVM pattern to decouple the WinForms/WPF UI from the logic.
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