When does the compiler dispatch a call dynamically?

There are 2 cases when a call will be dispatched dynamically:

1. When the receiver of the call is statically typed as dynamic

       1: dynamic d = new MyClass();
       2: d.Foo();
   

2. When any of the arguments to the call are statically typed as dynamic

       1: var o = new MyClass();
       2: dynamic d = 4;
       3: o.Bar(d);
   

By keeping the rules simple we hope to avoid cases where there is confusion about whether or not a call is dispatched dynamically.