ext.net中SelectBox绑定值有关问题

ext.net中SelectBox绑定值问题
前台代码：
 <ext:SelectBox
                        ID="SelectBox1"
                        runat="server"
                        Width="170"
                        DisplayField="state"
                        ValueField="abbr"
                        EmptyText="-请选择省-">
                        <Store>
                            <ext:Store runat="server" ID="Store1">
                                <Model>
                                    <ext:Model runat="server">
                                        <Fields>
                                            <ext:ModelField Name="Id" Type="Int" />
                                            <ext:ModelField Name="Name" Type="String" />
                                        </Fields>
                                    </ext:Model>
                                </Model>
                            </ext:Store>
                        </Store>
                        <DirectEvents>
                            <Select OnEvent="Store1_OnSelectedIndexChanged">
                            </Select>
                        </DirectEvents>
                    </ext:SelectBox>

后台绑定：
  DataTable Province = _ProvinceTableAdapter.GetData();

            this.SelectBox1.GetStore().DataSource = Province;
            this.SelectBox1.DataBind();
-----------------------------------------
怎么出来的没有绑定上去啊？？？？？？？？求解

------解决思路----------------------
 <ext:Model runat="server">
                                        <Fields>
                                            <ext:ModelField Name="state" Type="Int" />
                                            <ext:ModelField Name="abbr"  />
                                        </Fields>
                                    </ext:Model>

------解决思路----------------------
形容你这段代码就是《驴唇不对马嘴》
你selectbox上要绑定数据字段，与你数据源上的绑定的字段根本对应不上，怎么可能有数据