Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click If txtProductName.Text = "" Or txtPrice.Text = "" Then MessageBox.Show("Please enter product details.") Exit Sub End If Dim qty As Integer = Val(txtQty.Text) Dim price As Double = Val(txtPrice.Text) Dim subTotal As Double = qty * price ' Add row to DataGridView dgvInvoice.Rows.Add(txtProductName.Text, price, qty, subTotal) ' Update Grand Total CalculateTotal() ClearInputs() End Sub Use code with caution. 3. Calculating the Final Bill
If dt.Rows.Count > 0 Then Dim productID As Integer = dt.Rows(0)("ProductID") Dim pName As String = dt.Rows(0)("ProductName") Dim price As Decimal = Convert.ToDecimal(dt.Rows(0)("UnitPrice")) Dim gstPercent As Integer = Convert.ToInt32(dt.Rows(0)("GST_Percent")) vbnet+billing+software+source+code
Complete, downloadable source code from platforms like GitHub or SourceForge that you can modify or use for free. Private Sub btnAdd_Click(sender As Object, e As EventArgs)