C#如何禁用webbrowser使用

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    webBrowser1.Document.InvokeScript("eval", new object[] { "document.body.innerHTML = document.body.innerHTML.replace(/<a /g, '<a style=\\\"pointer-events: none;\\\"');" });
    webBrowser1.Document.InvokeScript("eval", new object[] { "document.body.innerHTML = document.body.innerHTML.replace(/<button /g,<button style=\\\"pointer-events: none;\\\"');" });
}

private void webBrowser1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
    e.IsInputKey = true;
}

private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
    e.Cancel = true;
}