How to using Timer in c# to hovering button?

How to using Timer in c# to hovering button?

I want to make hovering button in my game. Because when my cursor touch
the button it will go to another screen immediately. I don't like this so
much. I use xna 4.0 with visual studio 2010 to make this project. (use
kinect without wpf)
How to use timer in this case ? Please help me
if (Hand.contian(Button) && holdtime == targetHoldtime)
{
}