How to navigate from master page to login page

Hi

I want to navigate from master page to login page whenever I hit my url 

First time when i hit my url i should go directly to login page not on master page code

right now whne i hit my url my page redirect to mast page :( I need to press login button to go login page 

I want this login page as my first page wheneven i hit my url 

I used on page load  Response.Redirect("~/login.aspx") but it  alwys redirect to login page 

bcoz of thins i m unable to logn 

I tried both way ispostback or not postback 

below is  my code :

  If Not Session("UI") Is Nothing Then
            If user.Name <> "" Then
             
                Logoutbutton.Visible = True
                LoginButton.Visible = False
            
                MainMenu.Visible = True
                
            Else
                MainMenu.Visible = False
        
            End If
        Else
            Logoutbutton.Visible = False
            LoginButton.Visible = True
                
            MainMenu.Visible = False
            
        End If

can you please help how to solve this problem