title: howto generate a smooth movement in xna for wp7?
body: <p>i want to create a game and addes a image to my game, now i want it to move down smoothly. i have a code like this:</p>
  
  <pre><code>protected override void Update(GameTime gameTime)
          {
              if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                  this.Exit();
              pos.Y = pos.Y + 1;
              base.Update(gameTime);
          }
  </code></pre>
  
  <p>the movement works but it dont looks smooth, it looks like it jiggle. pos is a vector2 for the position in the image.</p>
  
  <p>how to make it more smooth?</p>