I think you should need WebBrowser.DocumentCompleted Event.
private void Form1_Load(object sender, EventArgs e)
{
WebBrowser WebBrowser = new WebBrowser();
WebBrowser.DocumentCompleted += WebBrowser_DocumentCompleted;
}
private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//do your function
}
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