For some reason i keep getting kicked back to my login page and i can't for the life of me work out WHY!

VB Code:
  1. <%@ trace="true" %>

  2. <script runat="server">

  3.  
  4.    Sub Page_Load

  5.     Dim checkstr as string

  6.     checkstr = Request.QueryString("action")

  7.     If User.Identity.ISAuthenticated = "false" then 

  8.         If not Request.QueryString("action") = "login" then

  9.             Response.Redirect("default.aspx?action=login")

  10.         end if

  11.     end if

  12.    End Sub

  13.  
  14.  
  15.    Sub Button_click

  16. Trace.Write( " txtUsername.text = " & txtUsername.text )

  17. Trace.Write( " txtPassword.text = " & txtPassword.text )

  18.     If txtUsername.text = "So" and txtPassword.text = "So" then

  19.     

  20.     FormsAuthentication.RedirectFromLoginPage( txtusername.text, chkRemember.Checked )

  21.         

  22.     else

  23.     

  24.     Response.Redirect("default.aspx?action=summ")

  25.         

  26.     End If

  27.    End sub

  28.  
  29. </script>

  30.  
  31. <% Select Case Request.QueryString("action")

  32.  
  33. Case "login"%>

  34.  
  35.  
  36. <html>

  37. <head><title>default.aspx?action=login</title></head>

  38. <body>

  39. <form Runat="Server">

  40.  
  41. <h2> Please Login: </h2>

  42.  
  43. <asp:Label

  44.   ID="lblMessage"

  45.   ForeColor="Red"

  46.   Runat="Server" />

  47.  
  48. <p>

  49. <b>Username:</b>

  50. <br>

  51. <asp:textbox

  52.  ID="txtUsername"

  53.  Runat="Server" />

  54. <p>

  55. <b>Password:</b>

  56. <br>

  57. <asp:textbox

  58.  ID="txtPassword"

  59.  Runat="Server" />

  60. <p>

  61. <asp:checkbox

  62.  ID="chkRemember"

  63.  Runat="Server" />

  64. Remember me with a cookie?

  65. <p>

  66. <asp:button

  67.   Text="Login!"

  68.   Runat="Server" />

  69.  
  70. </form>

  71.   

  72. <% Case "filelist" %>

  73.  
  74. <% Case "fileupload" %>

  75.  
  76. <% Case Else

  77.  
  78. Response.Redirect("Action is Null") %>

  79.  
  80. <% End Select %>


DEFAULT.ASPX


VB Code:
  1. <configuration>

  2.   <system.web>

  3.     <authentication mode="Forms">

  4.       <forms

  5.         name=".ASPXAUTH"

  6.         loginUrl="Default.aspx?action=login"

  7.         protection="All"

  8.         timeout="80"

  9.         path="/"/>

  10.       </authentication>

  11. <authorization>

  12. <deny users="?" />

  13. </authorization>

  14. <compilation debug="true"/>

  15.   </system.web>

  16. </configuration>

WEB.CONFIG

Also i want all log-in's to go to

efile.aspx?action=summ

can some help me on this to?