How to do it...

Follow these simple steps to register the routed command to the button click and perform the operation:

1. From the Solution Explorer, right-click on the project node and create a folder named Commands.

2. Right-click on the Commands folder and create a new class named RoutedCommands.cs by following the Add | Class... context menu path.
3. Inside the class implementation, declare a static member of type RoutedCommand and name it AddCommand. Here's the code implementation:

public class RoutedCommands 
{ 
    public static RoutedCommand AddCommand =  
                            new RoutedCommand(); 
} 

4. Add the following namespace to resolve the RoutedCommand class:

using System.Windows.Input; 

5. Once that has been done, navigate to the MainWindowViewModel.cs file, present under the ViewModels folder, and add a property named NewUserDetails of type UserModel. We will be using this property to bind with the Text property of the TextBox controls present in the UI. The property...