Class does not contain a definition for Method

Question

In class Employee I ve got some methods  which work fine  Now I wanted to add new method  for example  public void ExampleMethod                  Then I call it  Employee employee   new Employee    employee ExampleMethod      ExampleMethod is present in IntelliSense displayed after dot  when I hit F12 it also redirect me to that method  but while starting project I ve got an error   Employee  does not contain a definition for  ExampleMethod  and no extension method  ExampleMethod  accepting a first argument of type  Employee  could be found  are you missing a using directive or an assembly reference    I don t know why this error is caused  because all other earlier methods work fine  What s the problem

User · Answer

I just ran into this problem  the issue seems different from the other answers posted here  so I ll mention it in case it helps someone   In my case  I have an internal base class defined in one assembly   A    an internal derived class defined in a second assembly   B    and a test assembly   TEST     I exposed internals defined in assembly  B  to  TEST  using InternalsVisibleToAttribute  but neglected to do so for assembly  A    This produced the error mentioned at top with no further indication of the problem  using InternalsVisibleToAttribute to expose assembly  A  to  TEST  resolved the issue

User · Answer

I had the same problem  I changed the Version of Assembly in AssemblyInfo cs in the Properties Folder  But  I don t have any idea why this problem happened  Maybe the compiler doesn t understand that this dll is newer  just changing the version of Assembly

User · Answer

I had the same problem   Rebuild Solution  and then  Clean Solution  didn t work I solved that by  checking  my DLL references

User · Answer

Today I encountered a problem with the exact same symptoms as you describe  I closed all files and restarted VS only to find out that some files disappeared from the Solution Explorer   The following solved my problem  by selecting the current project in the Solution Explorer  a little icon Show all files appears on the top bar  Right-clicking the file and selecting Include In Project does the thing   Credit

User · Answer

There are three possibilities   1  If you are referring old DLL then it cant be used  So you have refer new DLL  2  If you are using it in different namespace and trying to use the other namespace s dll then it wont refer this method   3  You may need to rebuild the project   I think third option might be the cause for you  Please post more information in order to understand exact problem of yours

User · Answer

If you are using a class from another project  the project needs to re-build and create re-the dll  Make sure  Build  is checked for that project on  Build -  Configuration Manager in Visual Studio  So the reference project will re-build and update the dll

User · Answer

Create class with namespace name might resovle your issue   namespace Employee employee   new namespace Employee     employee ExampleMethod

User · Answer

I had the same issue when working in a solution with multiple projects that share code  Turned out that I forgot to update the DLL in the folder of the 2nd project   My suggestion is to take a good look at the  project  column in the Error list window and make sure that project also uses the right DLL

User · Answer

I had the same problem  Turns out the project I was referencing did not get build  When I went to the build configuration manager in visual studio and enabled the reference project   the issue got resolved

[c#] 'Class' does not contain a definition for 'Method'

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