XNA Game Studio Express
The amount of elapsed game time since the last update.
Assembly: Microsoft.Xna.Framework.Game (in microsoft.xna.framework.game.dll)
Fixed-step clocks update by a fixed time span upon every clock step. This results in uniform clock steps that may not actually track the wall clock time. Fixed-step clocks were popular on console systems where one had tight control over code and a fixed system performance. Fixed-step clocks are also useful when trying to achieve deterministic updates for debugging, offline rendering, or other such scenarios.