private void btn_save_test_Click(object sender, EventArgs e)
        {
            string dpPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "Blood_Tests.sqlite");
            var    db     = new SQLiteConnection(dpPath);

            db.CreateTable <Tbl_Tests>();
            Tbl_Tests tbl = new Tbl_Tests();

            tbl.Test_Name  = txt_test_name.Text;
            tbl.Test_Range = txt_test_range.Text;

            db.Insert(tbl);
            Toast.MakeText(this, "Record Added Successfully...,", ToastLength.Short).Show();
            txt_test_name.Text  = "";
            txt_test_range.Text = "";
            load_spiner_tests();
        }
        private void btn_delete_test_Click(object sender, EventArgs e)
        {
            string dpPath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "Blood_Tests.sqlite");
            var    db     = new SQLiteConnection(dpPath);


            var subitem = new Tbl_Tests();

            var item = new Tbl_Tests();

            item.Id = Convert.ToInt32(txt_test_id.Text);
            var data = db.Delete(item);

            Toast.MakeText(this, "Record Deleted Successfully...,", ToastLength.Short).Show();
            txt_test_name.Text  = "";
            txt_test_range.Text = "";
            load_spiner_tests();
        }