linkbutton in masterpage is not working for me with sub sub folders

C:\MyFYP\Website Content\ProductDetail
i have a masterpage at root folder (MyFYP) , i had create few webforms in the Website Content folder and ProductDetail folder and root folder as well, 
all the webforms are using the root masterpage and all the link button can work nicely and navigate to each other but except the webforms in the productDetail folder, 
i had research few hours from internet and get those resolveUrl and resolveClienUrl method and bla bla but still cant solve my problem. 
hope someone can tell me how can i solve this problem x.x
below is my code for the linkbutton that i create in masterpage
<li><asp:LinkButton ID="LinkButton10" runat="server" Width="70px" PostBackUrl="~/Website Content/Laptop.aspx">Laptops</asp:LinkButton></li>