private async Task OnAddProctor()
        {
            var res = await ExamServices.AddProctor(_examId, _proctorIdToAdd);

            if (res != ErrorCodes.Success)
            {
                await Modal.ErrorAsync(new ConfirmOptions()
                {
                    Title   = "Failed to add proctor to exam",
                    Content = ErrorCodes.MessageMap[res]
                });
            }
            else
            {
                await Modal.SuccessAsync(new ConfirmOptions()
                {
                    Title = "Successfully added proctor to exam"
                });

                _proctorIdToAdd = "";
            }
        }