Add
using in source is NOT the same as adding
reference to an assembly...
Adding
reference is there to let you access/use the classes form that (external) assembly in your code, where
using is there to create a kind of shortcut...
Let see the WriteLine (system.Console) method...
The very moment you have
reference to System core (mscorlib.dll), you can use this method, however without any
using you have to write it like this:
System.Console.WriteLine(...);
Adding
using, you can write a shorter code:
using System;
System.Console.WriteLine(...);
or
using System.console
System.Console.WriteLine(...);
As you described your case you skipped the 'add reference' part...
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