How to deactivate really a button in C# Winforms

Question

Hello,

With C# winforms, I try to create a small application, and I try to deactivate a button after clicking on it.

To disable the button, I use the following line:

button.Enabled = false;

but I realize that the button is grayed out but not disabled because when I click on it, it starts processing again.

How to actually disable a button under C# winforms?

 

Thanks.