下拉列表所选值

这看起来可能很微不足道，我曾经曾经知道如何做到这一点，但由于某种原因，这次我似乎无法理解它：

我有两个表：Hotel和HotelRoomsHotel表有HotelID和其他酒店详细信息，HotelID在HotelRooms找到不同的房型，每种房型都有描述。一家酒店可以有多种房型。

我有一个包含HotelID和RoomIDs的DropDownList。 HotelID来自会话变量。 HotelID是DropDownList; but the list displays房型. When房型are selected I want to display a GridView'的值，其中包含酒店房间详细信息，如描述，价格等。

我不能这样做，因为我的下拉列表的值是映射到Session ID的HotelID。请问如何从下拉列表的选定值中获取酒店房间详细信息？

更新：

网格视图的代码：

        string intResortID = Request.QueryString("intResortID ")
        string strRoomType = DropDownList2.SelectedValue;
        string connStr = ConfigurationManager.ConnectionStrings["bdsConnectionString"].ConnectionString;
        SqlConnection Con = new SqlConnection(connStr);
        SqlDataAdapter sdr = new SqlDataAdapter("SELECT TOP (100) PERCENT tblAvail.dtm, tblResortsRooms.strRoomType, tblResortsRooms.strDescription, tblAvail.intQty, tblAvail.curPrice, tblAvail.intResortID, tblResortsRooms.intWSCode FROM tblAvailable INNER JOIN tblResortsRooms ON tblAvail.intResortID = tblResortsRooms.intResortID AND tblAvail.strRoomType = tblResortsRooms.strRoomType WHERE (tblResortsRooms.curRecRate > 0) AND (tblAvail.intResortID = @intResortID) AND (tblAvail.strRoomType = @strRoomType) AND (tblAvailable.dtm >= { fn CURDATE() }) ORDER BY tblResortsRooms.strRoomType",Con);
        SqlParameter ResID = new SqlParameter("@intResortID", intResortID);
        SqlParameter RoomType = new SqlParameter("@strRoomType", strRoomType);
        sdr.SelectCommand.Parameters.Add(ResID);
        sdr.SelectCommand.Parameters.Add(RoomType);

      <asp:DropDownList ID="DropDownList2" runat="server" 
        DataSourceID="SqlDataSource2" DataTextField="strRoomType" 
        DataValueField="intResortID" 
        onselectedindexchanged="DropDownList2_SelectedIndexChanged" 
        AutoPostBack="True">
    </asp:DropDownList>
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
       SelectCommand="SELECT [intResortID], [strRoomType] FROM [tblResortsRooms] WHERE ([intResortID] = @intResortID)">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="intResortID" 
                PropertyName="SelectedValue" Type="Int32" />
        </SelectParameters>
    </asp:SqlDataSource>

string intResortID = Request.QueryString("intResortID ");
string strRoomType = DropDownList2.SelectedValue;
string connStr = ConfigurationManager.ConnectionStrings["bdsConnectionString"].ConnectionString;
SqlConnection Con = new SqlConnection(connStr);
SqlDataAdapter sdr = new SqlDataAdapter("SELECT TOP (100) PERCENT tblAvail.dtm, tblResortsRooms.strRoomType, tblResortsRooms.strDescription, tblAvail.intQty, tblAvail.curPrice, tblAvail.intResortID, tblResortsRooms.intWSCode FROM tblAvailable INNER JOIN tblResortsRooms ON tblAvail.intResortID = tblResortsRooms.intResortID AND tblAvail.strRoomType = tblResortsRooms.strRoomType WHERE (tblResortsRooms.curRecRate > 0) AND (tblAvail.intResortID = @intResortID) AND (tblAvail.strRoomType = @strRoomType) AND (tblAvailable.dtm >= { fn CURDATE() }) ORDER BY tblResortsRooms.strRoomType", Con);
SqlParameter ResID = new SqlParameter("@intResortID", intResortID);
SqlParameter RoomType = new SqlParameter("@strRoomType", strRoomType);
sdr.SelectCommand.Parameters.Add(ResID);
sdr.SelectCommand.Parameters.Add(RoomType);
DataTable results = new DataTable();
sdr.Fill(results);
resultsGridView.DataSource = results;   //Assuming resultsGridView is the name of the GridView on your ASPX page.
resultsGridView.DataBind();