How to have my Control informed when one of its events is assigned? (Solved)

See more:

C#

forms

event

Scenario:
I have designed a Control inheriting from TextBox.
I have implemented an event, which works well (does its job).

Problem:
I would like my Control to do something (invoke a method to check something and set some properties etc) every time this event is assigned from other class (the Form that contains my Control).

I am sure that this is possible.

I tried using add and remove keywords.
However, this broke my code in my OnEventName method.
It seems that an event declared with the add and remove syntax can neither be tested for null nor invoked...

So, what can I do?
I helped lots of people (I have gold authority). Maybe I can be helped by others too.
Thank you.


Some code:

public class MyTextBox : TextBox
{
    /* ... */

    public event MyEventHandler MyEvent;

    protected virtual void OnMyEvent(MyEventArgs e)
    {
        if (MyEvent != null)
            MyEvent(this, e);
    }

    /* ... */
}

public class MyForm : Form
{
    /* ... */

    private MyTextBox myTextBox;

    /* ... */

    public MyForm()
    {
        myTextBox = new MyTextBox();
        this.Controls.Add(myTextBox);
        myTextBox.MyEvent += SomeMethod; // Compatible arguments
        // And now, the Problem!
        // I want myTextBox to "feel" that something was assigned to its event and act accordingly.
    }

    /* ... */
}

The change I tried:

public class MyTextBox : TextBox
{
    /* ... */

    public event MyEventHandler MyEvent
    {
        add { MyEvent += value; DoSomething(); }     // Here I grab the opportunity to react in some way...
        remove { MyEvent -= value; DoSomething(); }  // Same here.
    }

    protected virtual void OnMyEvent(MyEventArgs e)
    {
        if (MyEvent != null)   // Error: The event 'MyEvent' can only appear on the left hand side of += or -=
            MyEvent(this, e);  // The same error.
    }

    /* ... */
}