UI Operation - MainWindow.SaveClicked

Consumes Service operations:

• IToDoService.CreateToDoItem
• IToDoService.ListToDoItemsForUser
• IToDoService.UpdateToDoItem

Consumes Component operations:

• ToDoComponentManager.CreateToDoItem
• ToDoComponentManager.GetToDoItem
• ToDoComponentManager.ListToDoItemsForUser
• ToDoComponentManager.UpdateToDoItem

Thrown exceptions:

• ToDoSample.Contract.InvalidIdException