Vbnet+billing+software+source+code

Note: This paper presents a simplified educational model. Production environments would require enhanced error logging, user authentication encryption, and potentially a migration to WPF or a Web API backend.

✅ Fast to customize – You want a new field on the invoice form? Open the designer, add a textbox, tweak the database table, and you're done. VB.NET + ADO.NET is incredibly direct.

✅ Great for learning – If you’re a student or junior dev, studying this code teaches practical CRUD operations, event handling, and report generation without the complexity of modern frameworks. vbnet+billing+software+source+code

✅ Local-first – No internet needed. Great for small shops, warehouses, or rural businesses.

✅ Printing & Barcodes – Many examples include direct printer support or barcode generation (e.g., using Graphics.DrawString or free barcode fonts). Note: This paper presents a simplified educational model

After mastering the basic vbnet billing software source code, consider adding:

| Column Name | Data Type | Description | | :--- | :--- | :--- | | CustomerID | INT (PK, Identity) | Unique ID | | CustomerName | NVARCHAR(100) | Bill to name | | GSTIN | NVARCHAR(15) | Customer GST number | | Phone | NVARCHAR(15) | Contact | ✅ Fast to customize – You want a

The following code demonstrates the transaction process—inserting the invoice header and items, and updating stock atomically.

Imports System.Data.SqlClient
Public Class InvoiceService
    Private dbHelper As New DatabaseHelper()
Public Function CreateInvoice(customerId As Integer, items As List(Of InvoiceItem)) As Boolean
        Dim queryInvoice As String = "INSERT INTO tbl_Invoices (Date, CustomerID, TotalAmount) VALUES (@Date, @CID, @Total); SELECT SCOPE_IDENTITY();"
        Dim queryItem As String = "INSERT INTO tbl_InvoiceItems (InvoiceID, ProductID, Quantity, UnitPrice) VALUES (@IID, @PID, @Qty, @Price);"
        Dim queryUpdateStock As String = "UPDATE tbl_Products SET StockQty = StockQty - @Qty WHERE ProductID = @PID;"
Using conn As SqlConnection = dbHelper.GetConnection()
            conn.Open()
            Dim transaction As SqlTransaction = conn.BeginTransaction()
Try
                Dim totalAmount As Decimal = items.Sum(Function(i) i.Total)
                Dim invoiceId As Integer
' 1. Insert Invoice Header
                Using cmd As New SqlCommand(queryInvoice, conn, transaction)
                    cmd.Parameters.AddWithValue("@Date", DateTime.Now)
                    cmd.Parameters.AddWithValue("@CID", customerId)
                    cmd.Parameters.AddWithValue("@Total", totalAmount)
                    invoiceId = Convert.ToInt32(cmd.ExecuteScalar())
                End Using
' 2. Insert Items and Update Stock
                For Each item In items
                    ' Insert Item
                    Using cmd As New SqlCommand(queryItem, conn, transaction)
                        cmd.Parameters.AddWithValue("@IID", invoiceId)
                        cmd.Parameters.AddWithValue("@PID", item.ProductID)
                        cmd.Parameters.AddWithValue("@Qty", item.Quantity)
                        cmd.Parameters.AddWithValue("@Price", item.UnitPrice)
                        cmd.ExecuteNonQuery()
                    End Using
' Update Stock
                    Using cmd As New SqlCommand(queryUpdateStock, conn, transaction)
                        cmd.Parameters.AddWithValue("@Qty", item.Quantity)
                        cmd.Parameters.AddWithValue("@PID", item.ProductID)
                        cmd.ExecuteNonQuery()
                    End Using
                Next
transaction.Commit()
                Return True
Catch ex As Exception
                transaction.Rollback()
                ' Log error
                Return False
            End Try
        End Using
    End Function
End Class

| Column Name | Data Type | Description | | :--- | :--- | :--- | | ProductID | INT (PK, Identity) | Unique ID | | ProductCode | NVARCHAR(50) | Barcode / SKU | | ProductName | NVARCHAR(200) | Description | | Rate | DECIMAL(18,2) | Selling price | | GST_Percent | DECIMAL(5,2) | 0, 5, 12, 18, 28 |

| Column Name | Data Type | | :--- | :--- | | DetailID | INT (PK, Identity) | | InvoiceNo | NVARCHAR(20) (FK) | | ProductID | INT (FK) | | Quantity | DECIMAL(18,3) | | Rate | DECIMAL(18,2) | | TaxableValue | DECIMAL(18,2) | | CGST_Amount | DECIMAL(18,2) | | SGST_Amount | DECIMAL(18,2) |