How to use webbrowser controller pop up the web page with the HTML element change?

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C#

I want to use the web browser controller to pop up the website and with the html element changed in c#.

For example i click on the button, it will pop up to the website and change the html element.

private void btn_TestLibFunc_Click(object sender, EventArgs e)
        {
            Process.Start("chrome.exe", "http://google.com");
            webBrowser1.Url = new Uri(@"http://google.com");
        }

void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
   {
       foreach (HtmlElement he in webBrowser1.Document.All.GetElementsByName("q"))
       {
           he.SetAttribute("value", "eeee");
       }
   }

What I have tried:

i have tried this above code it able to pop up chrome, but not able to change the html value.