ساخت یاداور -قرار ملاقات-آلارم در سی شارپ

using System.Globalization;

PersianCalendar pc = new PersianCalendar();
        DateTime Dtime = new DateTime();
        string selectTime;
        string selectsnooz;
        string selectring;
        string selectmsg;

        bool alarmset = false;
        bool snoozeset = false;

for (int i = 0; i <= 12; i++)
            {
                comboBox1.Items.Add(i.ToString());
            }
            for(int i=0; i <=59;i++)
            {
                if (i<10)
                {
                    comboBox2.Items.Add(0+i.ToString());
                }
                else
                {
                    comboBox2.Items.Add(i.ToString());
                }

omboBox3.Items.Add("AM");
            comboBox3.Items.Add("PM");

            comboBox4.Items.Add("1");
            comboBox4.Items.Add("5");
            comboBox4.Items.Add("10");

Dtime = DateTime.Now;
            textBox2.Text = pc.GetYear(Dtime) + "/" + pc.GetMonth(Dtime) + "/" + pc.GetDayOfMonth(Dtime);
            textBox3.Text = DateTime.Now.ToString("h:mm tt");

            if (alarmset)
            {
                if (textBox3.Text == selectTime && textBox1.Text == pc.GetYear(Dtime) + "/" + pc.GetMonth(Dtime) + "/" + pc.GetDayOfMonth(Dtime)) 
                {
                    alarmset = false;
                    System.Media.SystemSounds.Exclamation.Play();
                  
                    ringclass.ShowDialog();

                }