What I am doing wrong

Hello

I am developing a side scroller and when I modify the code it doesnt seem to work, I have tried reloading the project but it still does the same as I hadnt modifed the code, for example when my main character hits something an animation is triggered I have changed the animation but it still shows the "old one", what should I do, Im getting frustrated, I use the C# 2008 to write the code outside the TGB editor

Thanks in advance