ToShamsiDate

/// <summary>
/// Convert DateTime to Shamsi Date (YYYY/MM/DD)
/// </summary>
public static string ToShamsiDateYMD(this DateTime date)
{
 System.Globalization.PersianCalendar PC = new System.Globalization.PersianCalendar();
 int intYear = PC.GetYear(date);
 int intMonth = PC.GetMonth(date);
 int intDay = PC.GetDayOfMonth(date);
 return (intYear.ToString() + "/" + intMonth.ToString() + "/" + intDay.ToString());
}
/// <summary>
/// Convert DateTime to Shamsi Date (DD/MM/YYYY)
/// </summary>
public static string ToShamsiDateDMY(this DateTime date)
{
 System.Globalization.PersianCalendar PC = new System.Globalization.PersianCalendar();
 int intYear = PC.GetYear(date);
 int intMonth = PC.GetMonth(date);
 int intDay = PC.GetDayOfMonth(date);
 return (intDay.ToString() + "/" + intMonth.ToString() + "/" + intYear.ToString());
}
/// <summary>
/// Convert DateTime to Shamsi String 
/// </summary>
public static string ToShamsiDateString(this DateTime date)
{
 System.Globalization.PersianCalendar PC = new System.Globalization.PersianCalendar();
 int intYear = PC.GetYear(date);
 int intMonth = PC.GetMonth(date);
 int intDayOfMonth = PC.GetDayOfMonth(date);
 DayOfWeek enDayOfWeek = PC.GetDayOfWeek(date);
 string strMonthName, strDayName;
 switch (intMonth)
 {
 case 1:
 strMonthName = "فروردین";
 break;
 case 2:
 strMonthName = "اردیبهشت";
 break;
 case 3:
 strMonthName = "خرداد";
 break;
 case 4:
 strMonthName = "تیر";
 break;
 case 5:
 strMonthName = "مرداد";
 break;
 case 6:
 strMonthName = "شهریور";
 break;
 case 7:
 strMonthName = "مهر";
 break;
 case 8:
 strMonthName = "آبان";
 break;
 case 9:
 strMonthName = "آذر";
 break;
 case 10:
 strMonthName = "دی";
 break;
 case 11:
 strMonthName = "بهمن";
 break;
 case 12:
 strMonthName = "اسفند";
 break;
 default :
 strMonthName = "";
 break;
 }

 switch (enDayOfWeek)
 {
 case DayOfWeek.Friday:
 strDayName = "جمعه";
 break;
 case DayOfWeek.Monday:
 strDayName = "دوشنبه";
 break;
 case DayOfWeek.Saturday:
 strDayName = "شنبه";
 break;
 case DayOfWeek.Sunday:
 strDayName = "یکشنبه";
 break;
 case DayOfWeek.Thursday:
 strDayName = "پنجشنبه";
 break;
 case DayOfWeek.Tuesday:
 strDayName = "سه شنبه";
 break;
 case DayOfWeek.Wednesday:
 strDayName = "چهارشنبه";
 break;
 default:
 strDayName = "";
 break;
 }

 return (string.Format("{0} {1} {2} {3}", strDayName, intDayOfMonth, strMonthName, intYear));
}

string strShamsiDate1 = DateTime.Now.ToShamsiDateYMD();
string strShamsiDate2 = DateTime.Now.ToShamsiDateDMY();
string strShamsiDate3 = DateTime.Now.ToShamsiDateString();