Vb.net Billing Software Source Code -

A functional billing application typically includes these logic blocks:

-- Invoices Table CREATE TABLE Invoices ( InvoiceID INT PRIMARY KEY IDENTITY(1,1), InvoiceNumber NVARCHAR(20) UNIQUE NOT NULL, CustomerID INT FOREIGN KEY REFERENCES Customers(CustomerID), InvoiceDate DATETIME DEFAULT GETDATE(), SubTotal DECIMAL(10,2), GSTAmount DECIMAL(10,2), TotalAmount DECIMAL(10,2), PaymentMethod NVARCHAR(50), Status NVARCHAR(20) DEFAULT 'Pending' ); vb.net billing software source code

Using cmd As New SqlCommand(invoiceQuery, DBConnection.conn, transaction) cmd.Parameters.AddWithValue("@InvoiceNo", txtInvoiceNo.Text) cmd.Parameters.AddWithValue("@CustomerID", Convert.ToInt32(cmbCustomer.SelectedValue)) cmd.Parameters.AddWithValue("@Date", DateTime.Now) cmd.Parameters.AddWithValue("@SubTotal", subtotal) cmd.Parameters.AddWithValue("@GST", totalGST) cmd.Parameters.AddWithValue("@Total", totalAmount) cmd.Parameters.AddWithValue("@PaymentMethod", cmbPaymentMethod.Text) Why VB

Maintaining a database of customer names, contact info, and purchase history. Why VB.NET for Billing?

Public Shared Function GetAllProducts() As DataTable Dim dt As New DataTable() Try Dim query As String = "SELECT ProductID, ProductCode, ProductName, Category, UnitPrice, StockQuantity, GSTPercentage FROM Products" DBConnection.OpenConnection() Using adapter As New SqlDataAdapter(query, DBConnection.conn) adapter.Fill(dt) End Using Catch ex As Exception MessageBox.Show("Error: " & ex.Message) Finally DBConnection.CloseConnection() End Try Return dt End Function

When the "Finish" button is clicked, the software must loop through the grid and save each line item to the InvoiceItems table while updating the Products table to reduce stock. 5. Why VB.NET for Billing?