Create a database named BillingDB and run the following scripts:
Design and Implementation of a Scalable Billing and Invoice Management System using VB.NET vbnet+billing+software+source+code
' Business Logic: Calculate total price for a quantity Public Function CalculateTotal(qty As Integer) As Decimal Return Price * qty End Function End Class Create a database named BillingDB and run the
Utilizes ADO.NET to communicate between the UI and the database. 2. Database Schema (SQL Server) A robust system requires at least four primary tables: Products: ProductID , ProductName , UnitPrice , StockQty . Customers: CustomerID , CustomerName , Contact . Invoices: InvoiceID , InvoiceDate , CustomerID , TotalAmount . Customers: CustomerID , CustomerName , Contact
Private Sub CalculateTotal() Dim runningSum As Double = 0 For Each row As DataGridViewRow In dgvInvoice.Rows runningSum += Convert.ToDouble(row.Cells(3).Value) Next Dim taxAmount As Double = runningSum * taxRate Dim finalBill As Double = runningSum + taxAmount lblSubtotal.Text = runningSum.ToString("C2") lblTax.Text = taxAmount.ToString("C2") lblGrandTotal.Text = finalBill.ToString("C2") End Sub Use code with caution. Database Integration (ADO.NET)
Public Class frmProducts Private Sub frmProducts_Load(sender As Object, e As EventArgs) Handles MyBase.Load LoadProducts() End Sub Private Sub LoadProducts() Dim query As String = "SELECT ProductID, ProductCode, ProductName, Rate, GST_Percent FROM tbl_Products" dgvProducts.DataSource = GetDataTable(query) dgvProducts.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill End Sub