How to set Software Expiry Date Warning Message in Windows Application C# . "C# SOFT CODE"

How to set Software Expiry Date Warning Message in Windows Application C# . "C# SOFT CODE"

C# Code

 private void Login_Load(object sender, EventArgs e)

        {

            WarningMessageShow();

        }

        private void WarningMessageShow()

        {

            DateTime RegDate = Convert.ToDateTime("01/04/2017");

            DateTime expDate = Convert.ToDateTime("01/04/2019");

            DateTime currentDate = Convert.ToDateTime(DateTime.Now.ToShortDateString());

            TimeSpan t = expDate - currentDate;

            double nrOfDays = t.TotalDays;

            if (nrOfDays > 0)

            {

            }

            else

            {

                MessageBox.Show("Your software is expired. Please contact your software provider for renewal.");

            }

        }