Parser Error Default is not allowed here because it does not extend class System Web UI Page MasterType declaration

Question

I recently converted a website project to a web application project in Visual Studio 2008   I finally got it to compile  and the first page  the login screen  displayed as normal  but then when it redirected to the Default aspx page  I received an error   Parser Error Message   SOME NAMESPACE MyApplicationName WebApplication  Default  is not allowed here because it does not extend class  System Web UI Page     All of my pages inherit from a class called  BasePage  which extends System Web UI Page   Obviously the problem isn t with that class because the login aspx page displays without error  and it also inherits from that basepage   All the pages on the site  including the login page  are children of a masterpage   After some testing  I have determined what it is that causes the error  although I don t know WHY it does it    On all the pages where I have the following tag  the error does NOT occur    lt    MasterType VirtualPath    MasterPages MainMaster master    gt    On all the pages that do not contain that line  the error DOES occur   This is throughout the entire application   I have the tag only on pages where there has been a need to reference controls on the MasterPage   So  I thought I would just add that line to all my pages and be done with it   But when I add that line  I get a compile error   object  does not contain a definition for  Master   This error is coming from the designer cs file associated with the ASPX page that I have added the  MasterType  declaration to   I ve forced a rebuild of the designer file  but that doesn t change anything  I compared the content of the Master reference in the designer files between the login aspx  working  and the default aspx  not working  but they are exactly the same   Since I d really like to get it to work without having to add the  MasterType  declaration to everypage  and since that  fix  isn t working anyway  does anyone know why not having the  MasterType  declaration on an aspx file causes the parser error   Is there a fix for this   Example Code   Here is the code for login aspx and login aspx cs which is working without error   Login aspx       lt    Page Title    Language  C   MasterPageFile    MasterPages MainMaster master  AutoEventWireup  true  Inherits  SOME NAMESPACE MyApplicationName WebApplication Login  Codebehind  Login aspx cs    gt   lt    MasterType VirtualPath    MasterPages MainMaster master    gt    lt asp Content ID  Content1  ContentPlaceHolderID  ContentPlaceHolder  Runat  Server  gt       lt table gt       lt tr gt           lt td gt               lt asp UpdatePanel ID  upLogin  runat  server  gt                   lt ContentTemplate gt                       lt asp Panel ID  Panel1  runat  server  DefaultButton  Login1 LoginButton  gt                           lt asp Login ID  Login1  runat  server  LoginButtonStyle-CssClass  button                           TextBoxStyle-CssClass  textBoxRequired                           TitleTextStyle-CssClass  loginTitle    gt                           lt  asp Login gt                       lt  asp Panel gt                   lt  ContentTemplate gt               lt  asp UpdatePanel gt               lt asp UpdatePanel ID  upPasswordRecovery  runat  server  gt                   lt ContentTemplate gt                   lt asp PasswordRecovery ID  PasswordRecovery1  runat  server                   SubmitButtonStyle-CssClass  button  TitleTextStyle-CssClass  loginTitle                   SuccessText  Your new password has been sent to you                   UserNameInstructionText  Enter your User name to reset your password     gt                   lt  ContentTemplate gt               lt  asp UpdatePanel gt           lt  td gt       lt  tr gt       lt  table gt   lt  asp Content gt   lt asp Content ID  Content2  ContentPlaceHolderID  SideBarPlaceHolder  Runat  Server  gt       lt h2 gt Login lt  h2 gt       lt asp Button ID  btnCreateAccount  runat  server  Text  Create Account  OnClick  btnCreateAccount Click  CausesValidation  false    gt   lt  asp Content gt    Login aspx cs      using System  using System Collections Generic  using System Linq  using System Web  using System Web UI  using System Web UI WebControls  using SOME NAMESPACE MyApplicationName WebApplication  using SOME NAMESPACE MyApplicationName Bll   namespace SOME NAMESPACE MyApplicationName WebApplication       public partial class Login   BasePage               protected void Page Load object sender  EventArgs e                        Login1 Focus                      protected void btnCreateAccount Click object sender  EventArgs e                        Page Response Redirect    CreateUser default aspx                         Here is the code for default aspx and default aspx cs which is throwing the parser error when viewed in a web browser   Default aspx       lt    Page Title    Language  C   MasterPageFile    MasterPages MainMaster master  AutoEventWireup  True  Inherits  SOME NAMESPACE MyApplicationName WebApplication  Default  Codebehind  Default aspx cs    gt   lt    MasterType VirtualPath    MasterPages MainMaster master    gt   lt asp Content ID  MainContent  ContentPlaceHolderID  ContentPlaceHolder  Runat  Server  gt   lt div class  post  gt       lt h2 class  title  gt Announcements lt  h2 gt       lt p class  meta  gt Posted by Amanda Myer on December 15  2009 at 10 55 AM lt  p gt       lt div class  entry  gt           lt p gt The MyApplicationName CMDB will be down for maintenance from 5 30 PM until 6 30 PM on Wednesday  December 15  2009  lt  p gt       lt  div gt       lt p class  meta  gt Posted by Amanda Myer on December 01  2009 at 1 23 PM lt  p gt       lt div class  entry  gt           lt p gt The MyApplicationName CMDB is officially live and ready for use  lt  p gt       lt  div gt   lt  div gt   lt  asp Content gt   lt asp Content ID  SideBarContent  ContentPlaceHolderID  SideBarPlaceHolder  Runat  Server  gt       lt img src  images MyApplicationName jpg  alt  MyApplicationName Gremlin  width  250   gt   lt  asp Content gt    Default aspx cs      using System  using System Configuration  using System Data  using System Linq  using System Web  using System Web Security  using System Web UI  using System Web UI HtmlControls  using System Web UI WebControls  using System Web UI WebControls WebParts  using System Xml Linq  using SOME NAMESPACE MyApplicationName Bll  using SOME NAMESPACE MyApplicationName WebApplication   public partial class  Default   BasePage       protected void Page Load object sender  EventArgs e                  Thanks

User · Answer

I had copied and renamed the page  aspx cs   The page name was  mainpage  so the class name at the top of the cs file as follows     After renaming the class to match this error was resolved

User · Answer

For me I had all of the namespaces on the pages and none of the solutions above fixed it  My problem was in    lt    Page Language  C    AutoEventWireup  true   CodeBehind  xxx aspx cs   Inherits  xxx xxx xxx   MasterPageFile   masterurl default master    gt    Then in my aspx cs file the namespace did not match the Inherits tag  So it needed   namespace xxx xxx xxx   In the  cs to match the Inherits

User · Answer

I figured it out   The problem was that there were still some pages in the project that hadn t been converted to use  namespaces  as needed in a web application project   I guess I thought that it wouldn t compile if there were still any of those pages around  but if the page didn t reference anything from outside itself it didn t appear to squawk   So when it was saying that it didn t inherit from  System Web UI Page  that was because it couldn t actually find the class  BasePage  at run time because the page itself was not in the WebApplication namespace  I went through all my pages one by one and made sure that they were properly added to the WebApplication namespace and now it not only compiles without issue  it also displays normally   yay   what a trial converting from website to web application project can be

User · Answer

Remember   inherits is case sensitive for C   not so for vb net    Found that out the hard way

User · Answer

You can always refractor the namespace and it will update all the pages at the same time  Highlight the namespace  right click and select refractor from the drop down menu

User · Answer

Look for this   ANY page in your project that has a missing  or different Namespace     If you have ANY page in your project with  lt NO Namespace    OR a   DIFFERENT Namespace than Default aspx  you will get this    Cannot load Default aspx   or this    Default aspx does not belong here    ALSO   If you have a Redirect to a page in your Solution Project and the page which is to be Redirected To has a bad namespace -- you may not get a compiler error  until you try and run   If the Redirect is removed or commented-out  the error goes away     BTW -- What the hell do these error messages mean   Is this MS Access  with the  misdirection  --     DGK

User · Answer

I delete  that web page that i want to link with master page from web application add new web page in project then set the master page Initially I had copied web page from web site into Web application fro coping that  aspx page  I was converting website to web application as project

User · Answer

I had a similar error but not from a Conversion     System Web HttpException   Namespace Website MasterUserPages  is not allowed here because it does not extend class  System Web UI MasterPage   I was also extending the MasterPage class   The error was due to a simple compilation error in my Master Page itself   System Web HttpCompileException  c  directory path Website MasterUserPages Master 30   error CS1061   ASP masteruserpages master  does not contain a definition for  btnHelp Click  and no extension method  btnHelp Click  accepting a first argument of type  ASP masteruserpages master  could be found  are you missing a using directive or an assembly reference    I was not able to see the error until I moved the MasterPage to the root website folder   Once that was taken care of I was able to put my MasterPage back in the folder I wanted

User · Answer

I had this issue  as I had copied a  fairly generic  webpage from one of my ASP Net applications into a new application   I changed the relevant namespace commands  to reflect the new location of the file    but    I  had forgotten to change the Inherits parameter in the aspx page itself    lt    Page MasterPageFile    StylesheetTheme    Language  C       AutoEventWireup  true  CodeBehind  MikesReports aspx cs       Inherits  MikesCompany MikesProject MikesReports    gt    Once I had changed the Inherits parameter  the error went away

User · Answer

My issue was simple  the Master page and Master Designer cs class had the correct Namespace  but the Master cs class had the wrong namespace

[c#] Parser Error: '_Default' is not allowed here because it does not extend class 'System.Web.UI.Page' & MasterType declaration

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