public int OnScriptError(Host.IActiveScriptError error)
{
System.Runtime.InteropServices.ComTypes.EXCEPINFO exceptionInfo;
HResult.ThrowOnFailure(error.GetExceptionInfo(out exceptionInfo));
string sourceLine;
HResult.ThrowOnFailure(error.GetSourceLineText(out sourceLine));
throw new InvalidOperationException("unhandled JavaScript exception: " + exceptionInfo.bstrDescription);
}