C# WinForm ListBox 綁定數據庫代碼

這是我的代碼，其中monFile是表名，process是列名，在VS 2008 中運行正常

        private void Form1_Load(object sender, EventArgs e)
        {
            string sqlString = "SELECT DISTINCT process FROM monFile";
            DataSet ds = GetData(sqlString);

            listBox1.Items.Add("process");
            foreach (DataRow row in ds.Tables[0].Rows)
            {
                listBox1.Items.Add(row["process"].ToString());
            }
        }

        DataSet GetData(String queryString)
        {


            using (SqlConnection conn = new SqlConnection("Data Source=SIYUAN\SQLEXPRESS; Initial Catalog=monitor; User ID=siyuan; Pwd=123456"))
            {

                DataSet ds = new DataSet();

                try
                {
                    // Connect to the database and run the query.
                    conn.Open();
                    SqlDataAdapter adapter = new SqlDataAdapter(queryString, conn);

                    // Fill the DataSet.
                    adapter.Fill(ds);

                }
                catch (Exception ex)
                {

                    // The connection failed. Display an error message.
                    label1.Text = "Unable to connect to the database.";

                }

                return ds;
            }

        }