C # convert time time stamp format

// timestamp format into

public DateTime StampToDateTime(string timeStamp)

{

DateTime dateTimeStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));

long lTime = long.Parse(timeStamp + "0000000");

TimeSpan toNow = new TimeSpan(lTime); 

return dateTimeStart.Add(toNow);

}