Blocking dialogs in .NET WebBrowser control

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And for an easy way to inject that magic line of javascript, read how to inject javascript into webbrowser control.

Or just use this complete code: 

private void InjectAlertBlocker() {
    HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
    HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
    string alertBlocker = "window.alert = function () { }";
    scriptEl.SetAttribute("text", alertBlocker);
    head.AppendChild(scriptEl);
}

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