web content not fully loading through web crawler

I am new to asp.net creating a web crawler just for learning purpose. I want to use text from my webpage to search on a website in my case http://www.ieee.org/ when I click search button it should do search on above link and give me search results but It just opens this web page and in search results just show loading. am following tutorial from youtube https://www.youtube.com/watch?v=YOuF6Np9z40 here are pics of code and out put Code in C#