How to detect if mouse is idle

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C#

hi programmers, i'm in creating advanced video player
i want when mouse is idle(not moving) fullscreen parent mode change to fullscreen only video mode
its my code for this

<pre lang="C#">if //mouse is idle i want to this event happen
 {
Player1.FullScreenMode = FullScreenMode.Display;
}
if //mouse is not idle(moving) i want this event happen
 Player1.FullScreenMode = FullScreenMode.Parent;</pre>

thanks for your help

What I have tried:

i trying to detect if mouse is idle or not to change fullscreen mode to display pause, stop..etc buttons