Robert, >To pass the byte thingy across to the COM world I have to change it to an >object (I assume this is boxing?
No boxing here; arrays are already reference types. >Why can't I simply cast thingy at the time of call to an object like so > >DoTheCall( ref (object)thingy ); The compiler doesn't know if the callee will modify the parameter, and if so, if it will be possile to cast the returned value back to a byte[]. You have to determinte that yourself, and do the cast manually if necessary. Mattias === Mattias Sjögren [EMAIL PROTECTED] You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
