Vbnet+billing+software+source+code May 2026

This module handles all SQL connections and commands using SqlClient.

Imports System.Data.SqlClient
Module DatabaseHelper
' Change this connection string to match your SQL Server instance
Public ConnectionString As String = "Data Source=localhost;Initial Catalog=BillingDB;Integrated Security=True"
Public Function ExecuteNonQuery(ByVal query As String, Optional ByVal parameters As SqlParameter() = Nothing) As Integer
    Using conn As New SqlConnection(ConnectionString)
        Using cmd As New SqlCommand(query, conn)
            If parameters IsNot Nothing Then cmd.Parameters.AddRange(parameters)
            conn.Open()
            Return cmd.ExecuteNonQuery()
        End Using
    End Using
End Function
Public Function GetDataTable(ByVal query As String, Optional ByVal parameters As SqlParameter() = Nothing) As DataTable
    Dim dt As New DataTable()
    Using conn As New SqlConnection(ConnectionString)
        Using cmd As New SqlCommand(query, conn)
            If parameters IsNot Nothing Then cmd.Parameters.AddRange(parameters)
            Using da As New SqlDataAdapter(cmd)
                da.Fill(dt)
            End Using
        End Using
    End Using
    Return dt
End Function

End Module

CREATE TABLE tbl_Customers (
    CustomerID INT PRIMARY KEY IDENTITY(1,1),
    CustomerName NVARCHAR(100),
    Phone NVARCHAR(15),
    Email NVARCHAR(100)
);

✅ 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. This module handles all SQL connections and commands

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