birthdate

If you want to search for a birthday in the current year, then try something like this:

        private void btnSearch_Click(object sender, EventArgs e)
        {
            int day = 1; // say
            int month = 1; // say
            dateTimePicker1.Value = new DateTime(DateTime.Today.Year, month, day);
            dateTimePicker1.Select();
            SendKeys.Send("%{DOWN}");
        }