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Public Class frmSearchInvoice Private Sub btnSearch_Click(sender As Object, e As EventArgs) Handles btnSearch.Click Dim query As String = "SELECT InvoiceNo, InvoiceDate, CustomerName, GrandTotal FROM tbl_Invoice_Master m INNER JOIN tbl_Customers c ON m.CustomerID = c.CustomerID WHERE InvoiceNo LIKE '%' + @search + '%'" Dim param As SqlParameter = New SqlParameter("@search", txtSearch.Text) dgvInvoices.DataSource = GetDataTable(query, param) End Sub Private Sub dgvInvoices_DoubleClick(sender As Object, e As EventArgs) Handles dgvInvoices.DoubleClick Dim selectedInvoice As String = dgvInvoices.CurrentRow.Cells("InvoiceNo").Value.ToString() Dim frm As New frmInvoice() frm.LoadInvoiceForEdit(selectedInvoice) ' Implement this method to fetch existing invoice frm.ShowDialog() End Sub

This article provides a deep dive into creating a full-featured billing system using . You will learn the architecture, database design, and, most importantly, vbnet billing software source code that you can customize for real-world use. vbnet+billing+software+source+code

' 1. Insert Invoice Header Using cmd As New SqlCommand(queryInvoice, conn, transaction) cmd.Parameters.AddWithValue("@Date", DateTime.Now) cmd.Parameters.AddWithValue("@CID", customerId) cmd.Parameters.AddWithValue("@Total", totalAmount) invoiceId = Convert.ToInt32(cmd.ExecuteScalar()) End Using txtSearch.Text) dgvInvoices.DataSource = GetDataTable(query