Public Class BillingSystem ' Function to calculate total amount Public Function CalculateTotal(price As Double, qty As Integer, taxRate As Double) As Double Dim subTotal As Double = price * qty Dim taxAmount As Double = subTotal * (taxRate / 100) Return subTotal + taxAmount End Function ' Example usage in a Button Click event Private Sub btnGenerate_Click(sender As Object, e As EventArgs) Handles btnGenerate.Click Dim price As Double = CDbl(txtPrice.Text) Dim qty As Integer = CInt(txtQuantity.Text) Dim tax As Double = 5.0 ' Fixed 5% tax Dim finalTotal = CalculateTotal(price, qty, tax) lblTotal.Text = "Total: $" & finalTotal.ToString("N2") End Sub End Class Use code with caution. Copied to clipboard Key Components of Billing Software
Private Sub CalculateTotal() Dim runningSum As Double = 0 For Each row As DataGridViewRow In dgvInvoice.Rows runningSum += Convert.ToDouble(row.Cells(3).Value) Next Dim taxAmount As Double = runningSum * taxRate Dim finalBill As Double = runningSum + taxAmount lblSubtotal.Text = runningSum.ToString("C2") lblTax.Text = taxAmount.ToString("C2") lblGrandTotal.Text = finalBill.ToString("C2") End Sub Use code with caution. Database Integration (ADO.NET)
' 2. Insert Items and Update Stock For Each item In items ' Insert Item Using cmd As New SqlCommand(queryItem, conn, transaction) cmd.Parameters.AddWithValue("@IID", invoiceId) cmd.Parameters.AddWithValue("@PID", item.ProductID) cmd.Parameters.AddWithValue("@Qty", item.Quantity) cmd.Parameters.AddWithValue("@Price", item.UnitPrice) cmd.ExecuteNonQuery() End Using
Instead of rewriting connection strings in every form, use a global module.
Windows Forms ( .vb files) for user interaction.
For Each row As DataRow In dtDetails.Rows e.Graphics.DrawString(row("ProductName").ToString(), fontBody, Brushes.Black, leftMargin, yPos) e.Graphics.DrawString(row("Quantity").ToString(), fontBody, Brushes.Black, leftMargin + 200, yPos) e.Graphics.DrawString(row("Rate").ToString(), fontBody, Brushes.Black, leftMargin + 300, yPos) e.Graphics.DrawString(row("TaxableValue").ToString(), fontBody, Brushes.Black, leftMargin + 400, yPos) yPos += 20 Next
Vbnet+billing+software+source+code ((top)) -
Public Class BillingSystem ' Function to calculate total amount Public Function CalculateTotal(price As Double, qty As Integer, taxRate As Double) As Double Dim subTotal As Double = price * qty Dim taxAmount As Double = subTotal * (taxRate / 100) Return subTotal + taxAmount End Function ' Example usage in a Button Click event Private Sub btnGenerate_Click(sender As Object, e As EventArgs) Handles btnGenerate.Click Dim price As Double = CDbl(txtPrice.Text) Dim qty As Integer = CInt(txtQuantity.Text) Dim tax As Double = 5.0 ' Fixed 5% tax Dim finalTotal = CalculateTotal(price, qty, tax) lblTotal.Text = "Total: $" & finalTotal.ToString("N2") End Sub End Class Use code with caution. Copied to clipboard Key Components of Billing Software
Private Sub CalculateTotal() Dim runningSum As Double = 0 For Each row As DataGridViewRow In dgvInvoice.Rows runningSum += Convert.ToDouble(row.Cells(3).Value) Next Dim taxAmount As Double = runningSum * taxRate Dim finalBill As Double = runningSum + taxAmount lblSubtotal.Text = runningSum.ToString("C2") lblTax.Text = taxAmount.ToString("C2") lblGrandTotal.Text = finalBill.ToString("C2") End Sub Use code with caution. Database Integration (ADO.NET) vbnet+billing+software+source+code
' 2. Insert Items and Update Stock For Each item In items ' Insert Item Using cmd As New SqlCommand(queryItem, conn, transaction) cmd.Parameters.AddWithValue("@IID", invoiceId) cmd.Parameters.AddWithValue("@PID", item.ProductID) cmd.Parameters.AddWithValue("@Qty", item.Quantity) cmd.Parameters.AddWithValue("@Price", item.UnitPrice) cmd.ExecuteNonQuery() End Using Public Class BillingSystem ' Function to calculate total
Instead of rewriting connection strings in every form, use a global module. Insert Items and Update Stock For Each item
Windows Forms ( .vb files) for user interaction.
For Each row As DataRow In dtDetails.Rows e.Graphics.DrawString(row("ProductName").ToString(), fontBody, Brushes.Black, leftMargin, yPos) e.Graphics.DrawString(row("Quantity").ToString(), fontBody, Brushes.Black, leftMargin + 200, yPos) e.Graphics.DrawString(row("Rate").ToString(), fontBody, Brushes.Black, leftMargin + 300, yPos) e.Graphics.DrawString(row("TaxableValue").ToString(), fontBody, Brushes.Black, leftMargin + 400, yPos) yPos += 20 Next