//创建一个SqlConnection
        SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=pubs;Integrated Security=True");
        
        string SQL_Select = "select job_id,job_desc from dbo.jobs order by job_id desc";

        //构造一个SqlDataAdapter
        SqlDataAdapter myAdapter = new SqlDataAdapter(SQL_Select, conn);

        try
        {
            //开始读取数据
            conn.Open();
            try
            {
                DataSet dataSet = new DataSet();
                myAdapter.Fill(dataSet, "jobs");

                //指定DropDownList使用的数据源
                DropDownList1.DataSource = dataSet.Tables["jobs"].DefaultView;

                //指定DropDownList使用的表里的那些字段
                DropDownList1.DataTextField = "job_desc"; //dropdownlist的Text的字段
                DropDownList1.DataValueField = "job_id";//dropdownlist的Value的字段

                DropDownList1.DataBind();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                conn.Close();
                conn.Dispose();
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }

foreach (int i in Enum.GetValues(typeof(EnumArea)))
        {
            ListItem item = new ListItem(Enum.GetName(typeof(EnumArea), i), i.ToString());
            DropDownList1.Items.Add(item);
        }