Vbnet+billing+software+source+code ✦ < QUICK >

Create a database named BillingDB and run the following scripts:

Not all source code is created equal. When you are reviewing a VB.NET billing project, ensure it handles the following critical modules correctly:

Create a reusable module for database operations.

Imports System.Data.SqlClient
Module DBConnection
Public conn As SqlConnection
Public cmd As SqlCommand
Public da As SqlDataAdapter
Public dt As DataTable
Public Sub OpenConnection()
    ' Change Data Source according to your SQL Server instance
    conn = New SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=BillingDB;Integrated Security=True")
    If conn.State = ConnectionState.Closed Then
        conn.Open()
    End If
End Sub
Public Sub CloseConnection()
    If conn.State = ConnectionState.Open Then
        conn.Close()
    End If
End Sub
Public Function ExecuteQuery(ByVal query As String) As DataTable
    dt = New DataTable()
    Try
        OpenConnection()
        da = New SqlDataAdapter(query, conn)
        da.Fill(dt)
    Catch ex As Exception
        MessageBox.Show("Error: " & ex.Message)
    Finally
        CloseConnection()
    End Try
    Return dt
End Function
Public Sub ExecuteNonQuery(ByVal query As String)
    Try
        OpenConnection()
        cmd = New SqlCommand(query, conn)
        cmd.ExecuteNonQuery()
    Catch ex As Exception
        MessageBox.Show("Error: " & ex.Message)
    Finally
        CloseConnection()
    End Try
End Sub

End Module

Most VB.NET billing projects still lean heavily on Windows Forms. Open the solution in Visual Studio, and you’ll see the familiar drag-and-drop interface. For a desktop POS or invoice system, that’s perfectly fine — response time is instant, and there’s no web latency.

What’s typically included:

✅ Freelance dev for local clients – You can reskin and deploy quickly. Charge for customizations. vbnet+billing+software+source+code

✅ Hobbyist / student – Excellent for semester projects (just add some modern flair).

✅ Small shop owner with tech skills – If you can compile and edit the source, you save thousands vs. off-the-shelf POS.

❌ Enterprise or multi-location use – Avoid. No web interface, no cloud sync, no audit trails.

Billing software is data-heavy. Look for a project that uses SQL Server (Express or Standard). The code should demonstrate: Create a database named BillingDB and run the

Secure authentication using salt-hash (simplified here for demo).

Public Class LoginForm
    Private Sub btnLogin_Click(sender As Object, e As EventArgs) Handles btnLogin.Click
        Dim username As String = txtUsername.Text
        Dim password As String = txtPassword.Text
        Dim query As String = $"SELECT Role FROM tbl_Users WHERE Username='username' AND Password='password'"
        Dim dt As DataTable = ExecuteQuery(query)
    If dt.Rows.Count > 0 Then
        Dim role As String = dt.Rows(0)("Role").ToString()
        Dim mainForm As New MainDashboard(role, username)
        mainForm.Show()
        Me.Hide()
    Else
        MessageBox.Show("Invalid credentials!")
    End If
End Sub

End Class

Security Note: Never store plain passwords in production. Use SHA256 hashing. End Module

Public Class frmReport
    Private Sub btnLoadReport_Click(sender As Object, e As EventArgs) Handles btnLoadReport.Click
        Dim fromDate As DateTime = dtpFrom.Value
        Dim toDate As DateTime = dtpTo.Value
        Dim query As String = $"SELECT i.InvoiceNo, i.InvoiceDate, c.CustomerName, i.GrandTotal FROM tbl_Invoices i JOIN tbl_Customers c ON i.CustomerID = c.CustomerID WHERE i.InvoiceDate BETWEEN 'fromDate.ToString("yyyy-MM-dd")' AND 'toDate.ToString("yyyy-MM-dd")'"
        dgvReport.DataSource = ExecuteQuery(query)
        lblTotalSales.Text = "Total: " & (From row As DataGridViewRow In dgvReport.Rows Where Not row.IsNewRow Select Convert.ToDecimal(row.Cells("GrandTotal").Value)).Sum().ToString("N2")
    End Sub
End Class