Error running js or ajax in c# browser

I have a c# browser Windows form app (visual studio) which runs a php page , which includes js , and the c# browser runs basic js and it workd perfectly , but my main page is working good in normal browsers like ie, firefox, chrome it works good , but when i run my main page in c# browser , ajax doesnt work , js scripts doesnt work , i am not sure why its happening , need to rectify this problem.