Need help in word VSTO add-in in visual studio using internet explorer

SHDocVw.InternetExplorer IE = new SHDocVw.InternetExplorer();
           object Empty = 0;
           object URL = "https://searchengine.com/";



           IE.Visible = true;
           IE.Navigate2(ref URL, ref Empty, ref Empty, ref Empty, ref Empty);

           System.Threading.Thread.Sleep(5000);

           IE.Document.getelementbyid("search")="search text";

           IE.Quit();