private static async Task HandleExceptionAsync(HttpContext context, Exception exception, IErrorLogger errorLogger)
{
string errorCode = calculateErrorCode(context.TraceIdentifier);
string message = string.Format("Oopss... An error on web site occurred; please contact the help desk with the following error code: '{0}' [{1}]", errorCode, context.TraceIdentifier);
// Log.Error(exception, message);
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
errorLogger.SaveErrorException(exception, context.Request.Path, message);
await context.Response.WriteAsync(message);
}