The managed thread id of the message pumping thread of the Notification System. This thread will be created only if any of the control notification receivers have specified DeliverPolicyWhenControlIsHidden.CreateHWNDAndRetryImmediately and the HWND of the control hasn't been created yet when a message is to be sent to it. In this case the Notification System creates the HWND and it's associated message pump will leave in this thread. All controls that have their HWND created by the Notification System share the same message pumping thread.

public static int MessagePumpingThreadId { get; }

Public Shared ReadOnly Property MessagePumpingThreadId As Integer

public:
static property int MessagePumpingThreadId {
	int get ();
}