(please do not delete the question. no clearly formulated.)

How to highlight your structures and classes to separate files!? To then be

using myclass.sharp;

or somehow differently …

UPD
For clarity:

My.cs file with user (own, new) classes:

namespace mynumbrasses // My classes
{
  Public Class Mynumblass // My class
  {
    Public MynumberClass ()
    {
    }
  }
}

No matter how I do does not help using Mynumbrasses. Writes an error !!!

using my.cs;
using mynumclasses;

does not work in any way.
Maybe the file needs to put somewhere?

Main file “Form1.cs”:

....
Using System.Net; // WebClient
using mynumclasses;
....
Namespace windowsFormsapp1
{
  Public Partial Class Form1: Form
  {
    Public MynumberClass Tttest;
    Public String SMESSAGE = "NULL";
....

Failed to find the type or name of the namespace “MyNumberCase” (possibly missing directive using or link to the assembly)

Answer 1, Authority 100%

In C # Using , it does not work as include in C++. using does not import a specific class, and a whole Namespace .

1. Create a new file
2. Copy structure / class
3. at the place of use Add a string that will import namespace .

For example:

class.cs

namespace xxx
{
  Public Class Class {}
}

Program.cs:

using xxx; // Using may not be needed if both classes are in one namespace.
Namespace yyy.
{
  Public Class Program {} // Here you can use your class
}

Answer 2

You have a class that is in a specific namespace , for example:

namespace myapp.data
{
  Public Class MyDataclass.
  {
    // Implementation
  }
}

In order to create this instance of this class in another project file, you will need to “connect” it using using Pointing Namespace , in which the class you need, for example :

using myapp.data;
Namespace myapp.main.
{
  Public Class Mainclass.
  {
    Public Void Method ()
    {
      var data = new mydataclass ();
    }
  }
}

Answer 3

Thank you Grundy, public full answer:

In C # using it does not work as include in C++. Using does not import a specific class, but a whole namespace.

1. Create a new file (for example, My.cs)
2. Copy structure / class (see Question).

3. Add file to solution:
   In the PCM Solution Explorer Add- & GT; Existing Element (Add – & GT; Existing Item) – & gt; You choose your file

4. At the place of use of add a string that will import Namespace:

using mynumbrasses;

5. I also add that in this file you need to duplicate directives using the main part !!!
   That’s just then get a full include !!!