Read-only TextBox fields for txtSubTotal , txtTax , txtDiscount , and txtGrandTotal .
startY += 25e.Graphics.DrawString("----------------------------------------------------------------", fontBody, Brushes.Black, startX, startY)startY += 20
Build out the UI forms and link the underlying event handling logic. vb.net billing software source code
-- Invoice Master Table (One invoice per record) CREATE TABLE tbl_Invoice_Master ( InvoiceNo INT PRIMARY KEY IDENTITY(1,1), InvoiceDate DATETIME DEFAULT GETDATE(), CustomerID INT FOREIGN KEY REFERENCES tbl_Customers(CustomerID), SubTotal DECIMAL(18,2), TaxAmount DECIMAL(18,2), GrandTotal DECIMAL(18,2) );
Remember: the best source code is the one you understand and can modify. Download a working project, dissect its Form_Load , CalculateTotals , and SaveInvoice methods, and tailor it to your local tax laws and workflow. Read-only TextBox fields for txtSubTotal , txtTax ,
e.Graphics.DrawString(name, fontBody, Brushes.Black, startX, startY)e.Graphics.DrawString(price, fontBody, Brushes.Black, startX + 250, startY)e.Graphics.DrawString(qty, fontBody, Brushes.Black, startX + 350, startY)e.Graphics.DrawString(total, fontBody, Brushes.Black, startX + 430, startY)startY += 20Next
-- Invoice Details Table (Multiple rows per invoice) CREATE TABLE tbl_Invoice_Details ( DetailID INT PRIMARY KEY IDENTITY(1,1), InvoiceNo INT FOREIGN KEY REFERENCES tbl_Invoice_Master(InvoiceNo), ProductID INT FOREIGN KEY REFERENCES tbl_Products(ProductID), Quantity INT, Rate DECIMAL(18,2), Total DECIMAL(18,2) ); Download a working project, dissect its Form_Load ,
In retail, wholesale, and service industries, a reliable invoicing system is the backbone of daily operations. Building a desktop-based billing application using VB.NET and Windows Forms offers a robust, high-performance solution that works completely offline.
lblSubTotal.Text = subTotal.ToString("C") 'C = Currency format lblTax.Text = gstAmount.ToString("C") lblGrandTotal.Text = grandTotal.ToString("C")
Never concatenate raw text entries directly inside your runtime execution strings (e.g., WHERE ProductID = " & txtID.Text ). Direct concatenation creates vulnerabilities to . This project uses clean parameter assignments ( ? or @ParamName ) across all database reads and writes to ensure inputs are handled safely as discrete scalar values. 6. How to Deploy the Application
The main billing form ( frmBilling.vb ) requires a structured layout optimized for speed. Cashiers often rely heavily on keyboard entry. Recommended Form Layout Controls