How to set HREF Value of HTML Anchor tag inside ASP.Net DataList

I am using Datalist which is given below:

<asp:DataList ID="dList" runat="server" RepeatColumns="4" RepeatDirection="Horizontal" RepeatLayout="Table" DataKeyField="PId"
        Width="850px" align="center" >
    <ItemTemplate>
        <table width="210px">
            <tr>
                <td align="left">
                    <a href='Photos.aspx?fn=<%#Eval("FolderName")%>'
                        <img src="images/MainFolderImages/<%#Eval("Image")%>" height="120px" width="200px" alt="" ></img>
                    </a>
                </td>
            </tr>            
        </table>
    </ItemTemplate>
</asp:DataList>

My requirement is 

if(SubcatId==0)

{

 <a href='Photos.aspx?fn=<%#Eval("FolderName")%>'

}

else 

{

href='SubCategory2.aspx?id=<%#Eval("CId")%>'

}

How i will do it please suggest me.