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Related Code

public class RelayCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    readonly Action<object> _execute;
    readonly Predicate<object> _canExecute;


    public RelayCommand(
                        Action<object> execute,
                        Predicate<object> canExecute = null)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");

        _execute = execute;
        _canExecute = canExecute;
    }


    public void UpdateCanExecuteCommand()
    {
        if (CanExecuteChanged != null)
            CanExecuteChanged(this, new EventArgs());
    }


    public bool CanExecute(object parameter)
    {
        return _canExecute == null ? true : _canExecute(parameter);
    }


    public void Execute(object parameter)
    {
        _execute(parameter);
    }
}

Can be used like this in a ViewModel:

private ICommand _command;

public ICommand MyCommand
{
     get
     {
        if (_command == null)
               _command = new RelayCommand(p =>
                                        {
                                           //DoSomething()
                                        };
         return _command;
     }
}

In XAML:

 <button Command="{Binding MyCommand}" .../>

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