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The first parameter of DateTime.ParseExact is a string parameter named 's'.
Therefore, it looks like YearOfRelease or RunTime is null in your program. Make sure those are set before you call DateTime.ParseExact.
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DateTime dt2 = new DateTime();
dt = DateTime.ParseExact(YearOfRelease, "dd/MM/yyyy hh:mm:ss", null);
Year = dt.Year.ToString();
dt2 = DateTime.ParseExact(RunTime, "dd/MM/yyyy hh:mm:ss", null);
string hour = dt2.Hour.ToString();
string min = dt2.Minute.ToString();
Time = hour + ":" + min;