Vb.net Billing Software Source Code Best -

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.

Public Class frmProducts Private Sub frmProducts_Load(sender As Object, e As EventArgs) Handles MyBase.Load LoadProducts() End Sub Private Sub LoadProducts() Try Dim dt As DataTable = Product.GetAllProducts() dgvProducts.DataSource = dt dgvProducts.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill Catch ex As Exception MessageBox.Show("Error loading products: " & ex.Message) End Try End Sub vb.net billing software source code

Private Sub InitializeCartTable() dtCart.Columns.Add("ProductID", GetType(Integer)) dtCart.Columns.Add("ProductCode", GetType(String)) dtCart.Columns.Add("ProductName", GetType(String)) dtCart.Columns.Add("Quantity", GetType(Integer)) dtCart.Columns.Add("UnitPrice", GetType(Decimal)) dtCart.Columns.Add("GST", GetType(Decimal)) dtCart.Columns.Add("Total", GetType(Decimal)) dgvCart.DataSource = dtCart FormatDataGridView() End Sub This leaves the application wide open to SQL