c# - ArgumentException not working -

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is there reason why argumentexception might not work?

when moved our solutions .net 4.0, cannot use argumentexception.

string nodata = '--no data--' try {     instanceid = microsoft.xlangs.core.service.rootservice.instanceid.tostring(); } catch (argumentexception) {     instanceid = nodata;   }

when use exception class instead of argumentexception, can pass variable nodata instanceid.

catch (exception e) {     instanceid = nodata; }

the error encountering when

object reference not set instance object.

the problem doing in code catching argumentexceptions whereas before caught exceptions - exceptions derive exception fit old catch criteria.

if want catch specific exception (nullreference) need catch correct 1 (not argumentexception). change following:

catch (nullreferenceexception) {     instanceid = nodata;   }

but if don't have specific behavior nullreferenceexception i'd keep it:

catch (exception) {     instanceid = nodata; }

read msdn better understand catching specific types of exceptions


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