protected void showButton_Click(object sender, EventArgs e)
        {
            string dateFrom = Request.Form["dateFrom"];
            string dateTo   = Request.Form["dateTo"];

            int yearFrom  = int.Parse(dateFrom.Substring(0, 4));
            int monthFrom = int.Parse(dateFrom.Substring(5, 2));
            int dayFrom   = int.Parse(dateFrom.Substring(8, 2));


            int monthTo = int.Parse(dateTo.Substring(5, 2));
            int dayTo   = int.Parse(dateTo.Substring(8, 2));
            int yearTo  = int.Parse(dateTo.Substring(0, 4));

            List <int> observaIdList = new List <int>();

            if (yearTo < yearFrom)
            {
                megLabel.Text = "Incorrect date formet!";
            }
            else if (yearFrom == yearTo && monthTo < monthFrom)
            {
                megLabel.Text = "Incorrect date formet!";
            }
            else if (yearFrom == yearTo && monthTo == monthFrom && dayTo < dayFrom)
            {
                megLabel.Text = "Incorrect date formet!";
            }
            else
            {
                megLabel.Text = "";
                for (int i = dayFrom; ; i++)
                {
                    if (yearTo == yearFrom && monthTo == monthFrom && i == dayTo)
                    {
                        string date2    = yearFrom + "-" + monthFrom + "-" + i;
                        int    patient2 = treatmentManager.GetObservationIdForDistrict(date2);
                        observaIdList.Add(patient2);
                        break;
                    }
                    string date    = yearFrom + "-" + monthFrom + "-" + i;
                    int    patient = treatmentManager.GetObservationIdForDistrict(date);
                    observaIdList.Add(patient);
                    if (i == 31 && monthFrom != 12)
                    {
                        monthFrom++;
                        i = 0;
                    }
                    else if (monthFrom == 12 && dayFrom == 31)
                    {
                        yearFrom++;
                        monthFrom = 1;
                        i         = 0;
                    }
                }
            }
            List <int> observationIdList = new List <int>();
            int        diseaseId         = int.Parse(diseaseDropDownList.SelectedValue);

            foreach (int id in observaIdList)
            {
                int ObId = treatmentManager.GetObsId(id, diseaseId);
                observationIdList.Add(ObId);
            }
            List <int> centerIdList = new List <int>();

            foreach (int id in observationIdList)
            {
                int centerId = treatmentManager.GetCenterIdForDistrict(id);
                centerIdList.Add(centerId);
            }
            List <Center> districtNameList    = new List <Center>();
            List <Center> allDistrictNameList = centerManager.GetAllDistrict();

            foreach (int id in centerIdList)
            {
                List <int> districtIdList = centerManager.GetDistrictIdList(id);
                foreach (int disId in districtIdList)
                {
                    Center aCenter = new Center();
                    aCenter.DistrictName = centerManager.GetDistrict(disId);
                    districtNameList.Add(aCenter);
                }
            }
            List <Center> aCenterList = new List <Center>();

            foreach (var districtName in allDistrictNameList)
            {
                int count = 0;
                foreach (var nameOfDistrict in districtNameList)
                {
                    if (districtName.DistrictName.Equals(nameOfDistrict.DistrictName))
                    {
                        count++;
                    }
                }
                Center aCenter = new Center();
                aCenter.DistrictName = districtName.DistrictName;
                decimal population = centerManager.GetDistrictPopulation(aCenter.DistrictName);
                aCenter.Population = (count / population) * 100;
                aCenter.Count      = count;
                aCenterList.Add(aCenter);
            }
            reportGridView.DataSource = aCenterList;
            reportGridView.DataBind();
        }