string PersianDate(DateTime DateTime1)
{
PersianCalendar PersianCalendar1 = new PersianCalendar();
return string.Format(@"{0}/{1}/{2}",
PersianCalendar1.GetYear(DateTime1),
PersianCalendar1.GetMonth(DateTime1),
PersianCalendar1.GetDayOfMonth(DateTime1));
}
private void button1_Click(object sender, EventArgs e)
{
//سال تولد
string[] date = textBox1.Text.Split('/');
int BirdDayYear = Convert.ToInt32(date[0]);
//تاریخ جاری
string[] date2 = PersianDate(DateTime.Now).Split('/');
int NowYear = Convert.ToInt32(date2[0]);
//اختلاف دو تاریخ
label1.Text = (BirdDayYear - NowYear).ToString();
}