如何用条件检查列表框的项目

Question

我有一个编辑信息页面。我有一个cheboxlist，我用TBLGroupCustomers这样填写它：

using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.
                            ConnectionStrings["ZagmaDBConnectionString2"].ConnectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.CommandText = "select * from TBLGroupCustomers";
                    cmd.Connection = conn;
                    conn.Open();
                    using (SqlDataReader sdr = cmd.ExecuteReader())
                    {
                        while (sdr.Read())
                        {
                            ListItem item = new ListItem();
                            item.Text = sdr["GName"].ToString();
                            item.Value = sdr["GName"].ToString();
                            chkList.Items.Add(item);
                        }
                    }
                    conn.Close();

现在我想从TBLG_Groups我的代码中检查列表：

 SqlCommand sqlCmd1 = new SqlCommand("SELECT GName from TBLG_Groups WHERE CEmail = @cemail", connection);
            SqlDataAdapter sqlDa1 = new SqlDataAdapter(sqlCmd);

            string em1 = Request.QueryString["cemail"];
            sqlCmd.Parameters.AddWithValue("@cemail", em1 );
            sqlDa.Fill(dt);

            if (dt.Rows.Count > 0)
            {
                //how to do here?

            }
            connection.Close();

如何获取gnames cemails为em1的{​​{1}}的获取列表