.net - Unhandled DivideByZero exception from an external DLL - C# -

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i have c# (.net 4.0) program, main calling methods external ftp library - dll project references. logic in try-catch block, , catch prints error. exception handler has generic parameter: catch(exception ex). ide vs.

sometimes ftp library throws following division 0 exception. problem is not caught in catch block, , program crashes. exceptions originated in wrapper code caught. has idea difference , how exception can caught?

the exception:

description: process terminated due unhandled exception. exception info: system.dividebyzeroexception stack:    @ componentpro.io.filesystem+c_ou.c_f2b()    @ system.threading.executioncontext.runtrycode(system.object)    @ system.runtime.compilerservices.runtimehelpers.executecodewithguaranteedcleanup(trycode, cleanupcode, system.object)    @ system.threading.executioncontext.run(system.threading.executioncontext, system.threading.contextcallback, system.object, boolean)    @ system.threading.executioncontext.run(system.threading.executioncontext, system.threading.contextcallback, system.object)    @ system.threading.threadhelper.threadstart()

there similar problem described here , here explanation. said in 1 of comments ftp server should handle protocol violations without crashing. should pick ftp if can. however, if want keep using dll need handle exception @ app domain level blorgbeard pointed out.

here example of how catch exception using appdomain.unhandledexception event:

using system; using system.security.permissions;  public class test {     [securitypermission(securityaction.demand, flags = securitypermissionflag.controlappdomain)]    public static void example()    {        appdomain currentdomain = appdomain.currentdomain;        currentdomain.unhandledexception += new unhandledexceptioneventhandler(myhandler);         try        {           throw new exception("1");        }        catch (exception e)       {          console.writeline("catch clause caught : " + e.message);       }        throw new exception("2");        // output:        //   catch clause caught : 1        //   myhandler caught : 2    }    static void myhandler(object sender, unhandledexceptioneventargs args)   {       exception e = (exception)args.exceptionobject;      console.writeline("myhandler caught : " + e.message);   }    public static void main()   {      example();   }  }

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