Question

I am using datagrid and I have a <asp:TemplateField> I have passed some parameters in it the code is as follow:

<asp:TemplateField HeaderText="Download">
    <ItemTemplate>
        <asp:LinkButton ID="lnkname" runat="server" Text="Download" PostBackUrl='<%#"~/logout.aspx?ID="+Eval("ID")+"&category=mobile"%>'></asp:LinkButton>
    </ItemTemplate>
</asp:TemplateField>

I have numeric field (ID) which i need to send through URL I have tried to send the String type data and its working fine but while I am sending numeric type (ID) I am facing this error

Conversion from string “~/logout.aspx?ID=” to type ‘Double’ is not valid

I know something I need to change in the syntax near Eval("ID"). How should I send numeric data in query string?

Thanks

Answer 1

<asp:TemplateField HeaderText="Download">
                <ItemTemplate>
               <asp:LinkButton ID="lnkname" runat="server" Text="Download" PostBackUrl='<%# String.Format("~/logout.aspx?ID={0}&category=mobile", Eval("ID")) %>'></asp:LinkButton>
               </ItemTemplate>
               </asp:TemplateField>