private void btn_drawhide_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty((from w in Global.Db.tbl_Point_Hides where w.fBatchName == txt_fBatchName.Text select w.fBatchName).FirstOrDefault() + ""))
            {
                MessageBox.Show("Tọa độ đã tồn tại vui lòng điền tên tọa độ khác!");
                return;
            }
            if (string.IsNullOrEmpty(txt_fBatchName.Text))
            {
                MessageBox.Show("Hãy nhập tên batch !");
                return;
            }
            frm_DrawHide fd = new frm_DrawHide();

            fd.fbatchname = txt_fBatchName.Text;
            fd.ShowDialog();
            var a = (from w in Global.Db.GetBatch_ToaDo() select w.fBatchName).ToList();

            a.Insert(0, "");
            comboBox1.DataSource    = a;
            comboBox1.DisplayMember = "fBatchName";
            if (!string.IsNullOrEmpty((from w in Global.Db.tbl_Point_Hides where w.fBatchName == txt_fBatchName.Text select w.fBatchName).FirstOrDefault() + ""))
            {
                comboBox1.SelectedText = txt_fBatchName.Text;
            }
        }
        private void btn_ShowPoint_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(comboBox1.Text))
            {
                MessageBox.Show("Bạn chưa chọn tọa độ !");
                return;
            }
            frm_DrawHide fd          = new frm_DrawHide();
            string       fbatchPoint = comboBox1.Text;

            fd.fbatchname = fbatchPoint;
            fd.ShowDialog();
            var a = (from w in Global.Db.GetBatch_ToaDo() select w.fBatchName).ToList();

            a.Insert(0, "");
            comboBox1.DataSource    = a;
            comboBox1.DisplayMember = "fBatchName";
            if (!string.IsNullOrEmpty((from w in Global.Db.tbl_Point_Hides where w.fBatchName == txt_fBatchName.Text select w.fBatchName).FirstOrDefault() + ""))
            {
                comboBox1.SelectedText = txt_fBatchName.Text;
            }
        }