How to handl this masterpage in ASP.NET

I am now creating a website.I v almost done for Login page,register page and change password page.I v created the masterpage which is masterpage.master.

After i create a folder Accoumt and put all three pages ( login,register,changepassword aspx) into this Account folder.My masterpage is not working there.Masterpage cannot load in the folder

If i move those 3 pages outside of the folder...it works well.

Could you give me idea pls?

The master page in these 3 sentences are working at the ouside of the Account Folder.Otherwise it does not work...

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="ChangePassword.aspx.cs" Inherits="Account_ChangePassword" Title="Change Password"%>

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Account_Login" Title="LoginPage" %>

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Register.aspx.cs" Inherits="Register" Title=开发者_运维知识库"Register" %>

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May be a silly answer, but have you tried this?

MasterPageFile="../MasterPage.master"

assuming that your master page is in the upper level from your pages.

give it a try and let me know.