| Module | Description | |--------|-------------| | | Add, edit, delete, search products (Code, Name, Unit, Price, GST%, HSN code). | | Customer/Party Master | Manage customer details, credit limits, and GSTIN numbers. | | Invoice/Bill Entry | Create new bills, add line items, auto-calculate totals, taxes, discounts. | | Print Invoice | Generate printable or PDF invoices with company logo and terms. | | Stock Management | Track inventory quantities, low stock alerts, and stock valuation. | | GST / Tax Reports | Show tax breakup (CGST, SGST, IGST) and generate GSTR-1 like summaries. | | Sales Report | View daily, monthly, or custom date range sales. | | Backup & Restore | Backup SQL Server or MS Access database with one click. |

: A ComboBox ( cmbCustomer ) to select the customer. Product Selection Section :

A reliable billing application requires a relational database to maintain data integrity across products, customers, and invoices. For this implementation, we will use (or SQL Server Express), though the logic can easily be adapted for MySQL or MS Access. Our database consists of four core tables:

Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click If ValidateFields() Then Dim product As New Product() product.ProductCode = txtProductCode.Text product.ProductName = txtProductName.Text product.Category = txtCategory.Text product.UnitPrice = Decimal.Parse(txtPrice.Text) product.StockQuantity = Integer.Parse(txtStock.Text) product.GSTPercentage = Decimal.Parse(txtGST.Text)

Imports System.Data.SqlClient

Private Sub PrintReceipt() ' Simple print preview Dim printDialog As New PrintDialog() Dim printDocument As New Printing.PrintDocument()

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Products : Stores inventory items, stock levels, and pricing.

: This desktop application on GitHub uses an OLEDB connection to handle supermarket data efficiently.

: TextBoxes for txtGrandTotal , txtTax , and txtNetAmount . Action Row : Buttons for btnSaveAndPrint and btnClear . 5. Core VB.NET Source Code Implementation

Catch ex As Exception transaction.Rollback() MessageBox.Show("Error saving invoice: " & ex.Message) End Try

To take this from a basic template to production-ready enterprise systems, you should implement the following enhancements: Structured Exception Handling

End Sub