Understanding your database choice is crucial when selecting source code:
Imports System.Data.SqlClient Imports System.Configuration Public Class DbConnection Private Shared connString As String = ConfigurationManager.ConnectionStrings("BillingDBConn").ConnectionString Public Shared Function GetConnection() As SqlConnection Dim conn As New SqlConnection(connString) If conn.State = ConnectionState.Closed Then conn.Open() End If Return conn End Function Public Shared Function GetDataTable(query As String) As DataTable Dim dt As New DataTable() Using conn As SqlConnection = GetConnection() Using cmd As New SqlCommand(query, conn) Using adapter As New SqlDataAdapter(cmd) adapter.Fill(dt) End Using End Using End Using Return dt End Function End Class Use code with caution. 4. Building the Main Billing User Interface (UI)
Public Class Product Public Property ProductID As Integer Public Property ProductCode As String Public Property ProductName As String Public Property Category As String Public Property UnitPrice As Decimal Public Property StockQuantity As Integer Public Property GSTPercentage As Decimal Public Function AddProduct() As Boolean Try Dim query As String = "INSERT INTO Products (ProductCode, ProductName, Category, UnitPrice, StockQuantity, GSTPercentage) VALUES (@Code, @Name, @Category, @Price, @Stock, @GST)" DBConnection.OpenConnection() Using cmd As New SqlCommand(query, DBConnection.conn) cmd.Parameters.AddWithValue("@Code", ProductCode) cmd.Parameters.AddWithValue("@Name", ProductName) cmd.Parameters.AddWithValue("@Category", Category) cmd.Parameters.AddWithValue("@Price", UnitPrice) cmd.Parameters.AddWithValue("@Stock", StockQuantity) cmd.Parameters.AddWithValue("@GST", GSTPercentage) Return cmd.ExecuteNonQuery() > 0 End Using Catch ex As Exception MessageBox.Show("Error: " & ex.Message) Return False Finally DBConnection.CloseConnection() End Try End Function
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-- Create Database CREATE DATABASE BillingSystem; GO
Private Sub frmBilling_Load(sender As Object, e As EventArgs) Handles MyBase.Load InitializeCartTable() GenerateInvoiceNumber() LoadProducts() LoadCustomers() End Sub
: Apply a percentage for tax and add it to the subtotal to get the final amount. 2. Source Code: Generate Text Invoice Understanding your database choice is crucial when selecting
Here are some fundamental code snippets you'll find in quality billing source code:
Before we get into the code, it's important to understand why VB.NET remains a strong choice for this kind of business application.
Private Sub txtQuantity_TextChanged(sender As Object, e As EventArgs) Handles txtQuantity.TextChanged CalculateTotal() End Sub -- Create Database CREATE DATABASE BillingSystem; GO Private
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This repository provides a complete point-of-sale system designed for shops, built entirely with VB.NET. The project includes SQL database scripts for easy setup.