/// <summary>
        /// Prompts user to open XL wbk with latest iClick data.
        /// </summary>
        /// <returns>
        /// Returns name of opened XL workbook (string).
        /// If user canceled out of FileDialog returns an empty string.
        /// </returns>
        public bool PromptUserToOpenQuizDataWbk()
        {
            bool   userSelectedWbk = new bool();
            string testDataWbkNm   = string.Empty;

            Office.FileDialog fd = Globals.ThisWorkbook.Application.get_FileDialog(
                Office.MsoFileDialogType.msoFileDialogOpen);
            fd.Title            = "Latest iClick Results";
            fd.AllowMultiSelect = false;
            fd.Filters.Clear();
            fd.Filters.Add("Excel Files", "*.xlsx");

            // Handle user selection...
            if (fd.Show() == -1) // ...-1 == file opened; 0 == user cxled
            {
                userSelectedWbk = true;
                fd.Execute();
                testDataWbkNm = Globals.ThisWorkbook.Application.ActiveWorkbook.Name;
                _wbkTestData  = Globals.ThisWorkbook.Application.Workbooks[testDataWbkNm];
            }
            return(userSelectedWbk);
        }