gridview中显示bll层获取到的外键关联数据,该怎么处理

gridview中显示bll层获取到的外键关联数据
这个是具体问题的图片
下面发一部分前台的代码

<asp:TemplateField HeaderText="参观地点">

                                 <ItemTemplate>

                                    <script runat="server">

                                        BLL.CgAddress CgAddressBLL =new BLL.CgAddress();

                                       

                                    </script>

                                    <%#CgAddressBLL.GetAddressName(Convert.ToInt32(Eval("AddressID").ToString()))%>

                                    <asp:DropDownList ID="CgAddress" Width="100px" Visible="false" runat="server"></asp:DropDownList>

                                </ItemTemplate>

                                <EditItemTemplate>

                                    <asp:DropDownList ID="CgAddress" Width="100px" runat="server"></asp:DropDownList>

                                </EditItemTemplate>

                                <HeaderStyle Width="100px"  BorderColor="#9BD1Fa" BackColor="#9BD1Fa"/>

                                <ItemStyle Width="100px"  BorderColor="#9BD1Fa"/>

                            </asp:TemplateField>

后台绑定代码

public void YyInBind()

        {

            DataSet ds = Yyinfobll.GridDataSelect();

            YyInfo.DataSource = ds;

            YyInfo.DataKeyNames = new string[] { "ID" };

            YyInfo.DataBind();

         }

后台DAL查询代码

public DataSet GetAddress(int AddressID)

        {

            string sqlstring = ("SELECT AddressName FROM CgAddress WHERE AddressID=@AddressID");

            SqlParameter[] sqlparmeter =

            {

                new SqlParameter("@AddressID",SqlDbType.Int)

            };

            Model.CgAddress model = new Model.CgAddress();

            sqlparmeter[0].Value = AddressID;

            return SQLHelper.ExecuteDataSet(sqlstring, sqlparmeter);

        }

BLL代码

public DataSet GetAddressName(int AddressID)

        {

            return Addressdal.GetAddress(AddressID);

        }

问题描述
查询出来绑定到相应的位置上显示为system.data.dataset，具体怎么解决忘记了，好久没有用这个了，求指点
------解决思路----------------------
CgAddressBLL.GetAddressName(Convert.ToInt32(Eval("AddressID").ToString()))
你这个返回的是dataset  ToString()  肯定就是system.data.dataset
应该是ds.tables[0].Rows[0][0].ToString() 之类的吧