why Page.ResolveUrl gave me folder Characters Capital letters ?

 Greetings to you
 i don't know why this ..
i have folder Name like this 'hida' with small Characters .. not Capital  ok? that is not problem
when i use this method  Page.ResolveUrl it's return folder with Capital Characters ! why?
this is code i'm using 
 
        <asp:TemplateField HeaderText="Page Link">
            <ItemTemplate>
                <asp:TextBox ID="txt_Page_Link" Text ='<%# "http://" + Request.ServerVariables["SERVER_NAME"] + Page.ResolveUrl("~//"+Eval("PageID")) + ".aspx?ID=" + Eval("ID")%>' runat="server" Height="21px" Width="172px"></asp:TextBox>
Go to the complete details ...