How Can I Check Errors In Webbrowser

{
webBrowser1.Url = new Uri( "http://SomeRandomUrl");
            ((SHDocVw.WebBrowser)webBrowser1.ActiveXInstance).NavigateError += new SHDocVw.DWebBrowserEvents2_NavigateErrorEventHandler(Form1_NavigateError);//How can i found form1_NavigateError is calling or not from here?Because Some times when error is not found its not calling
.
.
.}
void Form1_NavigateError(object pDisp, ref object URL, ref object Frame, ref object StatusCode, ref bool Cancel)
        {
            int currentStatusCode = (int)StatusCode;