如何使用dropdownlist change事件在asp.net mvc 5中隐藏和显示div

I am trying to hide and show div in my mvc 5 project using dropdownlist change event, i have researched, and luckily i found this code online, but it doesn't seem to work for me, i will appreciate if anyone could point at where i am making mistakes. Thanks in advance.I am trying to hide and show div in my mvc 5 pr