Is it possible to use a control in a different content tag as a parameter?

Question

I currently have two Web Controls, one being a CheckBoxList, and the other a GridView. The GridView's data configuration has a parameter in it's query which is linked to the selected values from the CheckBoxList. However, when the two controls are in separate content tags like so:

<asp:Content ID="ListPanel" runat="server" ContentPlaceHolderID="LeftContent">

    <h3>Pick Info Here</h3>

    <asp:CheckBoxList ID="cbList1" runat="server" 

        DataSourceID="TestDataSource" 

        DataTextField="St" DataValueField="St" RepeatColumns="2">

    </asp:CheckBoxList>

</asp:Content>



<asp:Content ID="ResultsPanel" runat="server" ContentPlaceHolderID="RightContent">

    <asp:GridView ID="gView1" runat="server" 

        AllowPaging="True" AllowSorting="True" 

        AutoGenerateColumns="False" DataSourceID="TestDS1">

        <Columns>

         ... 

        </Columns>

    </asp:GridView>

    <asp:SqlDataSource ID="TestDS1" runat="server" 

    ... 

    SelectCommand="SELECT ST FROM [Table] where ST = ?">

    <SelectParameters>

        <asp:ControlParameter ControlID="cbList1" Name="?" 

            PropertyName="SelectedValue" />

    </SelectParameters>

</asp:SqlDataSource>

</asp:Content>

It works fine when I put both controls in the same

<asp:Content>

tag, but things call apart with an error of

System.InvalidOperationException: Could not find control 'cbList1' in ControlParameter '?'

. Is there a way to keep the controls separate, or do they have to be inside the same content tag?

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Answer 1

Apparently this can be done by prefixing the ContentPlaceHolderID to the ControlID of the parameter entry. In my case, the code would be:

SelectParameters>
        <asp:ControlParameter ControlID="LeftContent:cbList1" Name="?" 
            PropertyName="SelectedValue" />
    </SelectParameters>

since the Control the parameter reads from is in the LeftContent tag.

Is it possible to use a control in a different content tag as a parameter?

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