Writing into Visual Studio Output Window. Part 1

Lets assume that we have some Visual Studio 2010 Isolated Shell application (I suppose everything mentioned here should be valid for ordinary vspackages, but didn’t test, so cannot be sure). It may perform some operations (actually it is usually written to perform some operation, isn’t it?) and our task is to put log of these operations somewhere. Visual Studio has such nice feature like output window. And it is perfect candidate for such log, so post creates simple class to make it easy to write anything into log.