private async void YY_Picker_SelectedIndexChanged(object sender, EventArgs e)
        {
            List <StaffSubjectClass> lsc = new List <StaffSubjectClass>();

            try
            {
                var client = new HttpClient();
                client.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (compatible; AcmeInc/1.0)");
                var uri    = $"https://api.medmee.in/Subject/GetStaff_Subjects?SID={Application.Current.Properties["UID"].ToString()}&Branch={Branch_Picker.SelectedItem.ToString()}&YY={YY_Picker.SelectedItem.ToString()}";
                var result = await client.GetStringAsync(uri);

                var JSON_DATA = JsonConvert.DeserializeObject <List <StaffSubjectClass> >(result);
                var COUNT     = JSON_DATA.Count;

                for (int i = 0; i < COUNT; i++)
                {
                    StaffSubjectClass SC = new StaffSubjectClass()
                    {
                        SUBNAME = JSON_DATA[i].SUBNAME,
                    };
                    //lsc.Add(SC);

                    Subject_Picker.Items.Add(SC.SUBNAME);
                }

                //Subject_Picker.ItemsSource = lsc;
            }
            catch (Exception ee)
            {
                await DisplayAlert("Message", "No Data To Show", "Ok");
            }
        }
        public async void GetAllYears()
        {
            List <StaffSubjectClass> lsc = new List <StaffSubjectClass>();

            try
            {
                var client = new HttpClient();
                client.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (compatible; AcmeInc/1.0)");
                var uri    = $"https://api.medmee.in/Subject/GetAllYears?STID={Application.Current.Properties["UID"].ToString()}";
                var result = await client.GetStringAsync(uri);

                var JSON_DATA = JsonConvert.DeserializeObject <List <StaffSubjectClass> >(result);
                var COUNT     = JSON_DATA.Count;

                for (int i = 0; i < COUNT; i++)
                {
                    StaffSubjectClass ssc = new StaffSubjectClass()
                    {
                        YY = JSON_DATA[i].YY
                    };
                    YY_Picker.Items.Add(ssc.YY);
                }
            }
            catch (Exception ee)
            {
                await DisplayAlert("Message", "No Data To Show", "Ok");
            }
        }