.net - I need to accept from input file and that may be of any format in C# . i need to check the format and extract year -

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the format yyyymmdd not being accepted , throwing exception tried using 

string year = datetime.parseexact(usedate, "yyyymmdd",               cultureinfo.invariantculture).year.tostring();

do need use date variable ? , how date format yyyymmdd gets processed?

i have tested , works fine

datetime temp; if (datetime.tryparseexact("20130101", "yyyymmdd", cultureinfo.invariantculture, datetimestyles.none, out temp)) {      string year = temp.year.tostring(); }

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