masterpage issue when requesting forms

i have a dropdown menu  

<asp:DropDownList ID="category"
            runat="server" DataSourceID="SqlDataSource1" DataTextField="Videocategoryname"
            DataValueField="ID" AutoPostBack="True">
        </asp:DropDownList>


when i request my query  inside amasterpage it wont work....in anormal page it works fine

     <asp:SqlDataSource ID="SqlDataSource2" runat="server"
            ConnectionString="<%$ ConnectionStrings:JMIConnectionString %>"
            SelectCommand="SELECT * FROM [videotutorialitems] WHERE ([categoryid] = @categoryid)">
            <SelectParameters>
                <asp:formparameter FormField="category" Name="categoryid"
                    Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>