It is better do not enter critical section in callback function. about usbcamera

[secile]

I measured time to execute BufferCB function under frequently executed GetBitmap().

var timer = new System.Timers.Timer(100) { SynchronizingObject = this };
timer.Elapsed += (s, ev) => pbxScreen.Image = camera.GetBitmap();
timer.Start();

not change (use lock statement)

• average: 2271ms
• max: 23737ms
• over 10000ms: 12times (of 1000)

after change (use Monitor.TryEnter)

• average: 1878ms
• max: 7848ms
• over 10000ms: nothing (of 1000)

My conclution: It is better to use Monitor.TryEnter.