Lambda expressions and the Action<Object> delegate

The Action<Object> delegate is used in RelayCommands, DelegateCommands.

Code snippets below:
  public class SimpleDelegateCommand : ICommand
        Action<object> _executeDelegate;

          public SimpleDelegateCommand(Action<object> actionDelegate)
            _executeDelegate = actionDelegate;


 public class Methods
       // A method that doesn't had any parameters
        public static void NoParameterMethod()
            MessageBox.Show("The Method that doesn't take a parameter was Called");

The question I have is: Why is the following acceptable?

       private ICommand _test2Command = new SimpleDelegateCommand(y => Methods.NoParameterMethod());

That is:
given that the SimpleDelegateCommand needs and Action<object> delegate to be passed as an argument, how can a method that doesn't take any parameters be allowed by the delegate?
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Bob LearnedCommented:
If I look at the description for Action<T> delegate, I see a clue:

Action<T> Delegate

"You can use this delegate to pass a method as a parameter without explicitly declaring a custom delegate"

Methods.NoParameterMethod is a method, and the Action<T> delegate can be used to pass a method as an argument.

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