这是我的下拉列表代码............
<td valign="top" align="center">
<asp:DropDownList ID="StudentNameDropDownList" runat="server" Width="150px"
DataSourceID="SqlDataSource2" DataTextField="StudentName"
DataValueField="StudentName" AutoPostBack="True">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:dbbilling2.0ConnectionString3 %>"
SelectCommand="SELECT [StudentID], [StudentName] FROM [tblStudentInfo] WHERE ([Class] = @Class)">
<SelectParameters>
<asp:ControlParameter ControlID="ClassDropDownList" Name="Class"
PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
<br />
现在我想访问我的代码隐藏文件中的学生 ID 字段。我怎样才能做到这一点?我必须使用什么语法[如 dropdownlist.selecteditem] ?