Control.ControlCollection.Contains Method (Control)
Determines whether the specified control is a member of the collection.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The following code example removes a Control from the Control.ControlCollection of the derived class Panel if it is a member of the collection. The example requires that you have created a Panel, a Button, and at least one RadioButton control on a Form. The RadioButton controls are added to the Panel control, and the Panel control added to the Form. When the button is clicked, the radio button named removeButton is removed from the Control.ControlCollection.
Available since 1.1