static ChromiumWebBrowser()  
{  
    if (CefSharpSettings.ShutdownOnExit)  
    {  
        Application.ApplicationExit += OnApplicationExit;  
    }  
}  
  
private static void OnApplicationExit(object sender, EventArgs e)  
{  
    Cef.Shutdown();  
}

try  
{  
    browser.CloseDevTools();  
    browser.GetBrowser().CloseBrowser(true);  
}  
catch { }   
  
try  
{  
    if (browser != null)  
    {  
        browser.Dispose();  
        Cef.Shutdown();  
    }  
}  
catch { }