Application.AllowQuit Property  
Definition
Important
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Gets a value indicating whether the caller can quit this application.
public:
 static property bool AllowQuit { bool get(); };public static bool AllowQuit { get; }static member AllowQuit : boolPublic Shared ReadOnly Property AllowQuit As BooleanProperty Value
true if the caller can quit this application; otherwise, false.
Remarks
This property returns false if it is called from a Control being hosted within a Web browser. Thus, the Control cannot quit the Application.