private static int calculateYears(DateTime datefrom, DateTime dateto) { int int_year; int_year = dateto.Year - datefrom.Year; return int_year; }
private void button1_Click(object sender, EventArgs e) { listBox1.Items .Clear(); int result_year = calculateYears(dateTimePicker1.Value, dateTimePicker2.Value); listBox1.Items.Add("Result :" + result_year + " Year(s)"); }