c# - How to filter a grid view with a RadioBUttonList and Where Clausole -

i use c# in asp.net 4.

i have gridview , entitydatasource binding database.

source db table contains bool column (0,1).

i filter result in gridview using radiolist button or similar.

adding whereparameters entity set error:

string not recognized valid boolean.  

any idea how solve it? thanks

    <whereparameters>         <asp:controlparameter controlid="uxfiltermessagetypeselector"              name="typemessage" propertyname="selectedvalue" type="string" />         <asp:controlparameter controlid="uxfilterisreplied" name="isreplied"              propertyname="selectedvalue" dbtype="boolean" />     </whereparameters> 

---

    <asp:radiobuttonlist id="uxfilterisreplied" runat="server" autopostback="true">         <asp:listitem value="y">1</asp:listitem>         <asp:listitem value="f">0</asp:listitem>     </asp:radiobuttonlist> 

change radiobuttonlist following:

<asp:radiobuttonlist id="uxfilterisreplied" runat="server" autopostback="true">     <asp:listitem value="true">1</asp:listitem>     <asp:listitem value="false">0</asp:listitem> </asp:radiobuttonlist> 

then string recognized boolean value.