Vbnet+billing+software+source+code ^hot^ ✪

Secure user login restricting operations based on privileges (e.g., Admin vs. Cashier).

Configure a Key-Down event listener on a dedicated Product ID input box. Most hardware scanners append a carriage return ( Keys.Enter ) automatically, letting you fetch item records instantaneously without manual keyboard inputs.

Imports System.Data.SqlClient Public Class frmBilling ' Temporary runtime table to hold UI cart entries before database commitment Dim cartTable As New DataTable Private Sub frmBilling_Load(sender As Object, e As EventArgs) Handles MyBase.Load InitializeCart() LoadProducts() txtDate.Text = DateTime.Now.ToString("yyyy-MM-dd") End Sub Private Sub InitializeCart() cartTable.Columns.Add("ProductID", GetType(Integer)) cartTable.Columns.Add("Product Name", GetType(String)) cartTable.Columns.Add("Unit Price", GetType(Decimal)) cartTable.Columns.Add("Qty", GetType(Integer)) cartTable.Columns.Add("Total", GetType(Decimal)) dgvInvoice.DataSource = cartTable ' Optimize column layouts for user readability dgvInvoice.Columns("ProductID").Visible = False dgvInvoice.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill End Sub Private Sub LoadProducts() Using conn As SqlConnection = GetConnection() If conn Is Nothing Then Exit Sub Dim cmd As New SqlCommand("SELECT ProductID, ProductName, Price FROM Products", conn) Dim adapter As New SqlDataAdapter(cmd) Dim dt As New DataTable() adapter.Fill(dt) cboProducts.DataSource = dt cboProducts.DisplayMember = "ProductName" cboProducts.ValueMember = "ProductID" End Using End Sub ' Update price box when item choice switches Private Sub cboProducts_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cboProducts.SelectedIndexChanged If TypeOf cboProducts.SelectedValue Is DataRowView Then Exit Sub Using conn As SqlConnection = GetConnection() If conn Is Nothing OrElse Not IsNumeric(cboProducts.SelectedValue) Then Exit Sub Dim cmd As New SqlCommand("SELECT Price FROM Products WHERE ProductID = @ID", conn) cmd.Parameters.AddWithValue("@ID", cboProducts.SelectedValue) Dim price As Object = cmd.ExecuteScalar() If price IsNot Nothing Then txtUnitPrice.Text = Convert.ToDecimal(price).ToString("0.00") End If End Using End Sub ' Push validated item data into runtime memory cart grid Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click If String.IsNullOrEmpty(txtQty.Text) OrElse Not IsNumeric(txtQty.Text) Then MsgBox("Please enter a valid quantity.", MsgBoxStyle.Exclamation, "Validation") Exit Sub End If Dim prodID As Integer = Convert.ToInt32(cboProducts.SelectedValue) Dim prodName As String = cboProducts.Text Dim price As Decimal = Convert.ToDecimal(txtUnitPrice.Text) Dim qty As Integer = Convert.ToInt32(txtQty.Text) Dim total As Decimal = price * qty ' Check if product already exists in cart, update qty if it does Dim existingRow As DataRow() = cartTable.Select("ProductID = " & prodID) If existingRow.Length > 0 Then existingRow(0)("Qty") += qty existingRow(0)("Total") = Convert.ToDecimal(existingRow(0)("Qty")) * price Else cartTable.Rows.Add(prodID, prodName, price, qty, total) End If CalculateInvoiceTotals() txtQty.Clear() End Sub Private Sub CalculateInvoiceTotals() Dim subTotal As Decimal = 0 For Each row As DataRow In cartTable.Rows subTotal += Convert.ToDecimal(row("Total")) For Next Dim taxRate As Decimal = If(IsNumeric(txtTaxRate.Text), Convert.ToDecimal(txtTaxRate.Text), 0D) Dim taxAmount As Decimal = subTotal * (taxRate / 100) Dim grandTotal As Decimal = subTotal + taxAmount txtSubTotal.Text = subTotal.ToString("0.00") txtTaxAmount.Text = taxAmount.ToString("0.00") txtGrandTotal.Text = grandTotal.ToString("0.00") End Sub Private Sub txtTaxRate_TextChanged(sender As Object, e As EventArgs) Handles txtTaxRate.TextChanged CalculateInvoiceTotals() End Sub ' Commit transactions natively across standard tables Private Sub btnSaveInvoice_Click(sender As Object, e As EventArgs) Handles btnSaveInvoice.Click If cartTable.Rows.Count = 0 Then MsgBox("Cart is empty. Cannot save invoice.", MsgBoxStyle.Exclamation, "Validation") Exit Sub End If Using conn As SqlConnection = GetConnection() If conn Is Nothing Then Exit Sub ' Open explicit SQL transaction handler for system safety scope Dim transaction As SqlTransaction = conn.BeginTransaction() Try ' 1. Insert Master Records Dim cmdInvoice As New SqlCommand( "INSERT INTO Invoices (CustomerID, SubTotal, TaxRate, TaxAmount, GrandTotal) " & "VALUES (@CustID, @Sub, @TaxR, @TaxAmt, @Grand); SELECT SCOPE_IDENTITY();", conn, transaction) ' Defaulting safely to Customer ID 1 for walk-ins if empty cmdInvoice.Parameters.AddWithValue("@CustID", 1) cmdInvoice.Parameters.AddWithValue("@Sub", Convert.ToDecimal(txtSubTotal.Text)) cmdInvoice.Parameters.AddWithValue("@TaxR", Convert.ToDecimal(txtTaxRate.Text)) cmdInvoice.Parameters.AddWithValue("@TaxAmt", Convert.ToDecimal(txtTaxAmount.Text)) cmdInvoice.Parameters.AddWithValue("@Grand", Convert.ToDecimal(txtGrandTotal.Text)) Dim newInvoiceID As Integer = Convert.ToInt32(cmdInvoice.ExecuteScalar()) ' 2. Loop & Write Detailed Line Items + Deduct Warehouse Quantities For Each row As DataRow In cartTable.Rows Dim cmdItem As New SqlCommand( "INSERT INTO InvoiceItems (InvoiceID, ProductID, Quantity, UnitPrice, LineTotal) " & "VALUES (@InvID, @ProdID, @Qty, @Price, @LineTotal)", conn, transaction) cmdItem.Parameters.AddWithValue("@InvID", newInvoiceID) cmdItem.Parameters.AddWithValue("@ProdID", row("ProductID")) cmdItem.Parameters.AddWithValue("@Qty", row("Qty")) cmdItem.Parameters.AddWithValue("@Price", row("Unit Price")) cmdItem.Parameters.AddWithValue("@LineTotal", row("Total")) cmdItem.ExecuteNonQuery() ' Deducting Inventory Stock Quantities Dim cmdStock As New SqlCommand( "UPDATE Products SET StockQuantity = StockQuantity - @Qty WHERE ProductID = @ProdID", conn, transaction) cmdStock.Parameters.AddWithValue("@Qty", row("Qty")) cmdStock.Parameters.AddWithValue("@ProdID", row("ProductID")) cmdStock.ExecuteNonQuery() Next transaction.Commit() MsgBox("Invoice #" & newInvoiceID & " successfully generated and saved!", MsgBoxStyle.Information, "Success") ClearForm() Catch ex As Exception transaction.Rollback() MsgBox("Transaction processing failed. Structural rollback applied." & vbCrLf & ex.Message, MsgBoxStyle.Critical, "Error") End Try End Using End Sub Private Sub ClearForm() cartTable.Rows.Clear() txtSubTotal.Clear() txtTaxAmount.Clear() txtGrandTotal.Clear() txtTaxRate.Text = "0" End Sub End Class Use code with caution. Security & Optimization Best Practices

While there are many resources for , the query "vbnet+billing+software+source+code" could refer to a few different things depending on what you're looking for: vbnet+billing+software+source+code

VB.NET (Visual Basic .NET) is a popular programming language used for developing Windows-based applications. A billing software developed using VB.NET is a comprehensive solution for managing billing operations, including invoicing, payment tracking, and customer management. The source code is the foundation of the software, providing a customizable framework for businesses to tailor the solution to their specific needs.

Due to space, the above snippets form the core. A complete project file ( BillingSystem.sln ) includes:

This guide provides a comprehensive walkthrough and production-ready source code for a complete VB.NET billing software application utilizing an MS Access database ( .accdb ) via OLEDB connection. Database Architecture Secure user login restricting operations based on privileges

' Update Grand Total Label CalculateGrandTotal() End If End Sub

Private Sub PrintInvoice(ByVal invNo As String) ' Build invoice text Dim sb As New System.Text.StringBuilder() sb.AppendLine(" MY BILLING SOFTWARE ") sb.AppendLine("--------------------------") sb.AppendLine($"Invoice No: invNo") sb.AppendLine($"Date: DateTime.Now") sb.AppendLine("--------------------------") sb.AppendLine("Item Qty Price Total") For Each row As DataRow In cartTable.Rows sb.AppendLine($"row("ProductName") row("Quantity") row("Price") row("Total")") Next sb.AppendLine("--------------------------") sb.AppendLine($"Grand Total: lblGrandTotal.Text") sb.AppendLine("--------------------------") sb.AppendLine(" Thank you! ")

Module DBConnection Public conn As SqlConnection Public cmd As SqlCommand Public da As SqlDataAdapter Public dt As DataTable Most hardware scanners append a carriage return ( Keys

dgvBill.Rows(rowIndex).Cells("colAmount").Value = amount

┌─────────────────────────────────────────────────────────┐ │ User Interface (UI) │ │ Windows Forms (Invoice, Inventory, Reports) │ └────────────────────────────┬────────────────────────────┘ │ ┌────────────────────────────▼────────────────────────────┐ │ Business Logic Layer (BLL) │ │ Tax Calculations, Discounts, Stock Validation │ └────────────────────────────┬────────────────────────────┘ │ ┌────────────────────────────▼────────────────────────────┐ │ Data Access Layer (DAL) │ │ SQL Queries, Connections, CRUD Actions │ └────────────────────────────┬────────────────────────────┘ │ ┌────────────────────────────▼────────────────────────────┐ │ Database Server │ │ SQL Server / MS Access / MySQL │ └─────────────────────────────────────────────────────────┘ Key Modules

' Check if already in cart Dim existingRow() As DataRow = cartTable.Select($"ProductID = productID") If existingRow.Length > 0 Then existingRow(0)("Quantity") += 1 Dim qty As Integer = Convert.ToInt32(existingRow(0)("Quantity")) Dim totalBeforeGST As Decimal = qty * price Dim gstAmt As Decimal = totalBeforeGST * (gstPercent / 100) existingRow(0)("GST_Amount") = gstAmt existingRow(0)("Total") = totalBeforeGST + gstAmt Else Dim gstAmt As Decimal = price * (gstPercent / 100) Dim totalWithGST As Decimal = price + gstAmt cartTable.Rows.Add(productID, pName, 1, price, gstPercent, gstAmt, totalWithGST) End If CalculateTotals() txtProductCode.Clear() txtProductCode.Focus() Else MessageBox.Show("Product not found!") End If End If End Sub

This section provides source code snippets demonstrating the core functionality using VB.NET and ADO.NET.