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Vector2 nudgeVector = Vector2.Zero;
if (PlayerInput.GetKeyboardState.IsKeyDown(Keys.Up) && PlayerInput.GetOldKeyboardState.IsKeyUp(Keys.Up)){
    nudgeVector.Y = 1f;
}
if (PlayerInput.GetKeyboardState.IsKeyDown(Keys.Down) && PlayerInput.GetOldKeyboardState.IsKeyUp(Keys.Down)){
    nudgeVector.Y = -1f;
}
if (PlayerInput.GetKeyboardState.IsKeyDown(Keys.Left) && PlayerInput.GetOldKeyboardState.IsKeyUp(Keys.Left)){
    nudgeVector.X = -1f;
}
if (PlayerInput.GetKeyboardState.IsKeyDown(Keys.Right) && PlayerInput.GetOldKeyboardState.IsKeyUp(Keys.Right)){
    nudgeVector.X = 1f;
}
if (nudgeVector != Vector2.Zero && MapEntity.selectedList.Count > 0){
    foreach (MapEntity entityToNudge in MapEntity.selectedList){
        entityToNudge.Move(nudgeVector);
    }
}