100% CPU Usage ASP.NET App

[ditu]

I am using an ASP.NET application. On click of any control in the page, it is found that the CPU usage goes to 100% which result in slow response. And to come to the OnInit/Page_load it took around 9-10 seconds of time. During check in the task manager, there is one mscorsvw.exe running in the background and it tooks most of the CPU usage.Can somebody provide any input/hint, what could be the issue.