private void test_Load(object sender, EventArgs e)
        {
            using (SQLiteConnection con = new SQLiteConnection(Constants.DATA_SOURCE))
            {
                con.Open();
                using (SQLiteCommand cmd = new SQLiteCommand())
                {
                    cmd.Connection = con;
                    cmd.CommandText = string.Format("select t.org_short_name from sys_orgtable t  ");
                    int rows = cmd.ExecuteNonQuery();
                    SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd);
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    comboBox1.DataSource = dt;
                    comboBox1.DisplayMember = "org_short_name";
                }
            }
        }