Show date with time in PersianCalendar format in C#

hi

I used below code to change date to shamsi type (persian date)

    public string miladitoshamsi(object miladi1)
    {
        DateTime miladi = Convert.ToDateTime(miladi1);
        System.Globalization.PersianCalendar shamsi = new System.Globalization.PersianCalendar();
        return string.Format("{0}/{1}/{2}", shamsi.GetYear(miladi), shamsi.GetMonth(miladi), shamsi.GetDayOfMonth(miladi));

    }

but it just show date I want it shows date with time from database:

in database I save date and time in table

Date  datetime