' 2. Data Grid Title Columns header setupgraphicEngine.DrawString("Item Description Qty Price Total", fontBold, Brushes.Black, coordinateX, coordinateY)coordinateY += rowOffsetgraphicEngine.DrawString("-----------------------------------------------------", fontNormal, Brushes.Black, coordinateX, coordinateY)coordinateY += rowOffset
: Login system with role-based access (admin, cashier, staff). Implemented using session management or authentication classes.
End Class
Track customer profiles and billing history. vb.net billing software source code
-- Customer Master CREATE TABLE tbl_Customer ( CustomerID INT PRIMARY KEY IDENTITY(1,1), CustomerName NVARCHAR(100), Mobile NVARCHAR(15), GST_No NVARCHAR(15) NULL, -- for B2B OpeningBalance DECIMAL(18,2) DEFAULT 0 );
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Use libraries like iTextSharp to export the DataGridView content into a PDF invoice. End Class Track customer profiles and billing history
Add the required user interface controls onto the designer window ( txtCustomerName , cboProducts , dgvInvoiceItems , txtSubTotal , etc.), ensuring the names match the event handlers in the source code.
Subtract the quantity sold from the Products table automatically after each sale.
Dim query As String = "SELECT * FROM Invoices WHERE InvoiceID = " & txtInvoiceID.Text Subtract the quantity sold from the Products table
Implement a prior conditional evaluation inside btnAddToGrid_Click that references database stock levels. If StockQuantity - RequestedQuantity < 0 , flag a system warning to block sales when inventory is insufficient.
Live data entry grid that updates totals instantly.