public async Task <IActionResult> Search(DiseaseListingModel model)
        {
            if (String.IsNullOrWhiteSpace(model.SearchText))
            {
                return(RedirectToAction(nameof(All)));
            }

            var diseases = await this.diseaseService.Search(model.SearchText);

            return(View(diseases));
        }
        public async Task <IActionResult> All()
        {
            var diseases = await this.diseaseService.All();

            var diseasesModel = new DiseaseListingModel
            {
                DiseaseListing = diseases
            };

            return(View(diseasesModel));
        }