How to fix namespace x already contains a definition for x error Happened after converting to VS2010

Question

Specifically the error occurs in the Resources Designer cs      Error 2   The namespace  ModulusFE  already contains a definition for  StockChartX    Resources Designer cs   11  21  ModulusFE StockChartX   I ve googled this and am still quite confused  Does anyone know anything I might try   I have tried rebuilding and cleaning  as well as renaming the Resources Designer cs file in hopes that it would rebuild  but no luck   The top of the code says this       lt auto-generated gt         This code was generated by a tool         Runtime Version 4 0 30319 225           Changes to this file may cause incorrect behavior and will be lost if        the code is regenerated      lt  auto-generated gt    Any ideas whatsoever would be appreciated

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The way I solved it was to remove all of the enums from the model browser  and then re-add them again  Somehow miraculously the tool regenerated everything perfectly and the error message went away  I m using VS2012  FYI

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This just happened to me   What happened was that I duplicated a project that was originally under source control   Although I properly renamed everything  the file permissions on all the files were still set to read-only   When I started modifying some form controls  Visual Studio automatically created a Resource1 file because the original Resource file was read-only   What I did to fix this was as follows    allow write permissions on the project files  deleted the original Resource file Ctrl-A for all form elements  then Ctrl-X to cut them  Save the form  Ctrl-V to paste them all back  Save the form    I had to do this because the auto-generated code wasn t updating on it s own  so I  forced  it to update by making a change to the form   Not doing this left a bunch of code from form elements that no longer existed prior to changing the file permissions

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I had the same issue just now  and I found it to be one of the simplest of oversights   I was building classes  copying and pasting code from one class file to the others   When I changed the name of the class in  say Class2  for example  there was a dropdown next to the class name asking if I wanted to change all references to Class2  which  when I selected  yes   it in turn changed Class1 s name to Class2     Like I said  this is a very simple oversight that had me scratching my head for a short while  but double check your other files  especially the source file you copied from to ensure that VS didn t change the name on you  behind the scenes

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I came across a similar problem  After generating my database from an edmx file  I clicked  save all  and  build  and all the Types Model classes that I created showed up in the error box  I researched why this happened and like your replies suggest  I thought it was something that was auto-generated   However  solutions like deleting the auto-generated classes and re-generating them didn t work for me   I eventually ran out of patience and decided I d fix it another way  Since my script was saved  I just deleted the edmx file  and its reference in the web config  and went back and created another one using  model from database  and didn t touch it after that   Needless to say  I was pretty mad that it turned out like that

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I had a similar problem and resolved it by removing any copies backups of the  cs file from the directory

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I had this same problem and it was due to naming a function in the code behind the same as my tool  Simple mistake but something to keep in mind as well

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I had this happen to me about a year ago and I don t remember exactly what the root cause was  but there are two things you might try     If it s an auto-generated file  as  Resources Designer cs  tend to be   try deleting it and letting VS re-generate it  Either separately or in conjunction with  1  select Show All Files in the Solution Explorer or open the solution folder in Windows Explorer - it could be that a version of the file somehow got excluded from the project and is therefor  invisible  to VS but still makes it angry

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This happened to me  I noticed that there was actually another class with that same name under the same namespace  OtpService Models Request   so all I did was to just change the namespace of the 2nd class to  OtpService Models Request ExtraObj   I did this because I did not want to change the name of the conflicting class to anything else

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I had this problem  It was due to me renaming a folder in the App Code directory and releasing to my iis site folder  The original named folder was still present in my target directory - hence duplicate -   I don t do a full delete of target before copying  Anyway removing the old folder fixed this

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when you have tried everything else and still get the same trouble  there is a way out  however it will be tedious and need careful preparation   Start another new project using existing files  or edit the project  csproj file if you are proficient in editing csproj  need backup   I will list steps for new project    preparation    note all references and their sources note all included files from another project  rename the orginal projectname csproj file close solution project start new project using existing files you will get errors from references  add back the noted references include add existing file from other project s

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This error happened to me when I was using Visual Studio Code   I think it must have been because I was trying to build a project while there was an executable running in the same bin debug folder  I stopped the executable  closed the folder  reopened  rebuilt  and the error went away

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This is an old question but I didn t find the fix I used  so I ve added it here   In my case it was a namespace with the same name as a class in the parent namespace    To find this  I used the object browser and searched for the name of the item that was already defined   If it won t let you do this while you still have the error then temporarily change the name of the item it is complaining about and then find the offending item

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I had a similar issue however found a different solution than what I have read   I came to my fix after reading P Walker s answer     My issue happened when I named my resource file for Japanese language incorrectly   Long story short I was trying to create a Resource for Japanese but I accidentally named it localized jp resx   I then realized that the iso language code is ja not jp for Japanese   Once I changed the file name to localized ja resx and deleted everything that was in the designer file it fixed my problem     This is what fixed my problem hopefully it helps someone else

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I had an xaml file with the following definition   lt Window x Class  mm2 Views      etc     gt    mm2 Views was the name of a namespace in my app   To fix it  I correctly renamed the xaml object    lt Window x Class  mm2 Views RecordedTracks      etc     gt

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if you have 2 versions of any of your code file    cs    vb etc   inside your  app code  folder then you will get this error because dot net would include both the files in your project and will get 2 different implementations of the same class  because of same name in 2 versions of same code file in app code folder

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Unfortunately  none of the other answers helped  My problem specifically occurred in a WPF project    The problem arose when I created a folder under the MainWindow folder  which effectively created a namespace something like ProjectName MainWindow Folder  Now  I believe because of some static designer code  Visual studio gets confused between the class MainWindow and the namespace Project MainWindow Folder    As a solution  I moved the Folder out of MainWindow  Looking at the Class View or the solution project helps to recognize what namespaces and classes within them exist

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If you are using different aspx cs files that define classes of the same name you can use    lt compilation targetFramework  4 5    gt    under  lt system web gt  in your web config file   Although I would still strongly advise that you would change the class name

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I think this issue is because you have added for a single table  2 DAL classes  If this table is included in a relation  then remove the table name dbml for it  and keep that for the related tables  You must use one of them

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This is not the best solve  but if you really don t care it is an easy solution  I simply renamed my class  So I had class Card and I changed it to MyCard

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I ve had this problem  too  and it was because I created a new namespace  but the parent namespace contained a class with the same name

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Looks like a bug in VS code s OmniSharp   Solution for me was to execute command  Restart OmniSharp    Just do  - ctr shift P - type  Restart OmniSharp     hit enter  This fixed it for me

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look this happend to me when I created new file inside a folder with the same name of class in the project   folder name   Folder   and there is class name   Folder   so the namespace was the namespace Folder so that the compiler assume that the cass defined in two places   in new file    namespace APP Folder       partial class NewFile                                  in the other file   the file that hase the problem        namespace APP       partial class Folder                               -- so you can edit the folder name or remove the  Folder from the namespace at the new file

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I came across this partial class problem in a winform of a solution after converting from  net 4 5 1 to 4 7 2    Initially the problem the compiler was not complaining about partial class but the use of properties default   without qualification  After adding Global  solnNameSpace  qualifiers  then I got the partial class problem   after viewing answers in this thread  I look at the resource  designer file  I found it was generated with explicit solnNameSpace while the classes in the solution did not  Also the solnNameSpace is the same as the name of the problematic class name   To fix the problem with the least effort and time I backed out Global    qualifier and removed the explicit namespace     and end statements from the resource designer file  I know I may get in trouble later on if there were changes that cause auto generation of the resource designer file but I was was under tight deadline  I made documentation on the temp change instead of a better long term solution since the solution is under no change allowed for nature of the solution and multi project use

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I had something similar to this happen in my WPF application   It arose when I was trying to do some cleanup by declaring a namespace that was more descriptive   The problem arose because I had named the namespace in the code-behind  or cs  the same as the Window class   The namespace in the code-behind should have the last section stripped  after the rightmost dot  and used to declare the class and instantiate it   Notice Win below     xaml   lt Window x Class  FrameApp UI Invoice Win      gt   code-behind  namespace FrameApp UI Invoice       public partial class Win   Window               public Win             An obvious oversight but it set me back at least an hour with all the errors that appeared

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Me too got this error  When I change my WPF project s Target Framework to Framework Version 4 0 Client Profile -  Framework 4 0  It s solved by itself

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I had this issue  but mine was slightly different to the issues mentioned here  I was cleaning up my project and moving around some classes into new folders  I had a  AddFilter  class that I moved into an  AddFilter  folder - so I had actually wound up with a class that was sharing the name of a namespace  This was a bit tricky to spot at first because I couldn t find any other classes that it was conflicting with  it was conflicting with the namespace instead

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If you copy amp paste your pages don t forget to rename class names  Otherwise you get this error also with  Type already defines a member called  OnGet  with the same parameter types

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I had a similar problem  Universal project  Visual Studio 2015   I solved it with the following changes   In App xml cs was  it was ok    namespace Test Main     Wrong  old version of App xml   x Class  Test Main    Good  new version of App xml   x Class  Test Main App

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This may be a bit of an edge case  but we ve run across this in our development environment from time to time   We had to setup a custom culture in Windows to support en-HK  Windows 8 1 now supports this culture natively as does Windows 2012 R2  but older machines need to have the culture created   Any machine that does not have this culture setup will get this error reported   The solution is to create the culture on the machine  We have a console app created for this purpose  and everything starts working again

[c#] How to fix "namespace x already contains a definition for x" error? Happened after converting to VS2010

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