Q:
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How is the dynamic type different from the Object type?

if declare let#s say a COM-object as dynamic you can call it's methods, e.g.

dynamic ApplicationClass = new ApplicationClass();
wordApp.Quit();

if you'd declare it as object "wordApp.Quit();" wouldn't compile
since it not a method belonging to System.Object

Also all the stuff concerning the cacheing and analyzing done by DLR
to dynamic vars, is a probably a huge differnce in terms of performance

Chris