Convert a string array to comma separated string

 protected void Page_Load(object sender, EventArgs e)
    {
        Commaseparatedstring();
    }

    private void Commaseparatedstring()
    {
        string[] numbers = { "123", "234", "345", "456", "567", "789" };
        string numbersstring = String.Join(",", numbers);
        Response.Write(numbersstring);
    }