Data Binding: GridView & CheckBoxList & SQL

[rob]

Here is my scenario:

One of my aspx pages has a CheckBoxList (Item1, Item2) and a GridView.
Then I have a database that has the columns Item1 and Item2 (among
others) with the data type bit. What I am trying to do is to only show
the data sets chosen by the user. So for example if the user checks
Item1 in the CheckBoxList then only the datasets that have Item1 set to
True should be listed in the GridView. Here is what I tried:

Checkboxlist
------------
<asp:CheckBoxList OnSelectedIndexChanged="ItemsIndexChanged
ID="CheckBoxListItems" RepeatColumns="2"
RepeatDirection="Vertical"
RepeatLayout=Table TextAlign="Right" Runat="server" >
<asp:ListItem>Item1</asp:ListItem>
<asp:ListItem>Item2</asp:ListItem>
</asp:CheckBoxList>

GridView
--------
<asp:GridView ID="GridView1" Runat="server"
DataSourceID="SqlDataSourceItems"
AutoGenerateColumns="False" AllowSorting="True"
AllowPaging="True">
<Columns>
<asp:BoundField HeaderText="Item1" DataField="Item1"
SortExpression="Item1">
</asp:BoundField>
<asp:BoundField HeaderText="Item2" DataField="Item2"
SortExpression="Item2">
</asp:BoundField>
</Columns>
</asp:GridView>

SqlDataSource
-------------
<asp:SqlDataSource ID="SqlDataSourceTssdSecFilling" Runat="server"
SelectCommand="SELECT * FROM [MyTable]
WHERE (([Item1] = @Item1) AND ([Item1] = @Item2))"
ConnectionString="<%$ ConnectionStrings:AppConnectionItems %>"
OnSelecting="SqlDataSourceItems_Selecting">
<SelectParameters>
<asp:ControlParameter Name="Item1"
ControlID="CheckBoxListItems" Type="Boolean"
PropertyName="??????">
</asp:ControlParameter>
<asp:ControlParameter Name="Item2"
ControlID="CheckBoxListItems" Type="Boolean"
PropertyName="??????">
</asp:ControlParameter>
</SelectParameters>
</asp:SqlDataSource>

I just can't get this to work no matter what I set for the two
controlParameters in the SqlDataSource. It works just fine for a
TextBox. Any help is appreciated.

Regards,
Rob