C importing class into another class doesn t work

Question

I m quite new to C   and have made a class that I would like to use in my main class  These two classes are in different files  but when I try to import one into the other with using  cmd says says      The type or namespace name  MyClass  could not be found  are you missing a using directive or an assembly reference    I know that in Java I have to mess around with CLASSPATH to get things like this to work  but I have no idea about C    Additional details   As you ve probably figured out  I m compiling and executing via command prompt  I m compiling my non-main class using  target library  I heard that only main classes should be  exe-files    My code looks like this   public class MyClass       void stuff                and my main class   using System  using MyClass   public class MyMainClass       static void Main             MyClass test   new MyClass               Doesn t work              I have tried to encompass my non-main class with namespace MyNamespace     and importing that  but it doesn t work either

User · Answer

If the other class is compiled as a library (i.e. a dll) and this is how you want it, you should add a reference from visual studio, browse and point to to the dll file.

If what you want is to incorporate the OtherClassFile.cs into your project, and the namespace is already identical, you can:

Close your solution,

Open YourProjectName.csproj file, and look for this section:

<ItemGroup>                                            
    <Compile Include="ExistingClass1.cs" />                     
    <Compile Include="ExistingClass2.cs" />                                 
    ...
    <Compile Include="Properties\AssemblyInfo.cs" />     
</ItemGroup>

Check that the .cs file that you want to add is in the project folder (same folder as all the existing classes in the solution).
Add an entry inside as below, save and open the project.
```
<Compile Include="OtherClassFile.cs" /> 
```

Your class, will now appear and behave as part of the project. No using is needed. This can be done multiple files in one shot.

User · Answer

using is used for importing namespaces not classes   So if your class is in namespace X  namespace X       public class MyClass            void stuff                           then to use it in another namespace where you want it  using System  using X   public class MyMainClass       static void Main             MyClass test   new MyClass

User · Answer

I know this is very old question but I had the same requirement and just discovered that after c 6 you can use static in using for classes to import    I hope this helps someone      using static yourNameSpace YourClass

User · Answer

using is for namespaces only - if both classes are in the same namespace just drop the using   You have to reference the assembly created in the first step when you compile the  exe   csc  t library  out MyClass dll MyClass cs csc  reference MyClass dll  t exe  out MyProgram exe MyMainClass cs   You can make things simpler if you just compile the files together   csc  t exe  out MyProgram exe MyMainClass cs MyClass cs   or  csc  t exe  out MyProgram exe   cs   EDIT  Here s how the files should look like   MyClass cs   namespace MyNamespace       public class MyClass           void stuff                          MyMainClass cs   using System   namespace MyNamespace       public class MyMainClass           static void Main                 MyClass test   new MyClass

User · Answer

If they are separate class files within the same project  then you do not need to have an  import  statement   Just use the class straight off   If the files are in separate projects  you need to add a reference to the project first before you can use an  import  statement on it

User · Answer

namespace MyNamespace       public class MyMainClass               static void Main                         MyClass test   new MyClass                         public class MyClass               void Stuff                                  You have no need for using a namespace then because it is all encompased in the same namespace   If you are unsure of what namespace your class is located  type the class  case sensitive you wish to use  then with your cursor on the class  use CTRL     and it will offer you a manual import

User · Answer

MyClass is a class not a namespace  So this code is wrong   using MyClass   THIS CODE IS NOT CORRECT   You should check the namespace of the MyClass  e g  MyNamespace   Then call it in a proper way   MyNamespace MyClass myClass  new MyNamespace MyClass

User · Answer

Well what you have to  import   use  is the namespace of MyClass not the class name itself  If both classes are in the same namespace  you don t have to  import  it   Definition MyClass cs  namespace Ns1       public class MyClass                             Usage AnotherClass cs  using Ns1   namespace AnotherNs       public class AnotherClass               public AnotherClass                         var myInst   new MyClass

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