hi all
im new to xna
so im just writing on my first game.
so for now i made a "bomb" class, wichs draws my bomb and checks for collision between the bomb and a jeep.
if there is one, the current bombstate changes to "jeeephit"

---

//update
           if (aCurrentbombstate == bombstate.jeephit)
            {
                if (!justonce)
                {
                    thetime = (float)theGameTime.ElapsedGameTime.TotalSeconds;
                    justonce = true;
                }
                showntime = (float)theGameTime.ElapsedGameTime.TotalSeconds - thetime;

                propertime = Convert.ToInt32(showntime);
...

---

//draw
            if (aCurrentbombstate == bombstate.hit)
            {
                if (propertime <= 3)
                {
                    base.mSpriteTexture = wragtexture;
                    base.Scale = 0.8f;
                    base.Source = new Rectangle(0, 0, wragtexture.Width, wragtexture.Height);
                    base.Draw(theSpriteBatch);
                }
            }

---

and displays , on the last known vector2 of the bomb, a "damaged jeep". 3 seconds later the damaged jeep should disappear, but he doesn't

can someone please help me, i dont want the damaged jeep to stay there for ever!!

Note that GameTime.ElapsedGameTime contains the time since the last call to Update. So at 60 frames per second, this time will be 1/60sec long, or about 0.016666sec. This value will be the same for each call to Update (for a fixed framerate game that is). So your "thetime" is set to 0.016666, then showntime is set to 0.016666 - thetime, i.e. to 0. That you convert to an int to assign to propertime. So at the end, propertime is always 0.

Use GameTime.TotalGameTime instead, for your purposes.

Or even better, do something like this: Ditch "showntime" and "propertime", and only use "thetime":

// update:
if (!justonce) {
    thetime = 0;
    justonce = true;
}
thetime += (float)theGameTime.ElapsedGameTime.TotalSeconds.

// draw:

if (aCurrentbombstate == bombstate.hit) {
  if (thetime <= 3.0) {
    // bla bla
  }
}


Doc

GameTime.ElapsedGameTime is the time that has passed since the last update. If you are waiting for it to get really big, it won't. You might be looking for GameTime.TotalGameTime, which is the time since the game started. If you want to take some action after a set amount of time you can either keep a running total (i.e. add gameTime.ElapsedGameTime to a member variable on each update) or look into using Timers or the Stopwatch class.