DisposableObject fix for HasUnmanagedResources
Code Contracts introduced
Contracts
NuGet packages update
Contracts improvements.
Tests and fixes.
Refactoring of Contract namespace
CodeContracts tests
Missing files added
Samples of argument validation
Refactoring
Missing file
Refacotring.
Contracts update
Some Validation classes moved!
Refactoring.
ModalService repaired.
ConcurrentObservableCollection added
Mvvm dialog refactoring
Cleaup