Hello guys,
I was searching how to make multi layer arduino solution in Visual Studio 2017 and I decided to ask to forum.arduino.cc 
. While I writing a question topic , I found the solution
Now, this is not a question. This is a learn topic.
Layers like this:
---> MySeatSolution(Solution)
-------> MySeatProject.Core (Library Project)
-------> MySeatProject.Model1 (Sketch1)
-------> MySeatProject.Model2 (Sketch2)
I tried some things. My step :
1) Create New Arduino Library Project
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2) Add Two Sketch Projects to Solution
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now, my solution looks like :
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3) Creating a "SerialConsole" Common Class To CoreLibrary Project
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4) SerialConsole.h
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#pragma once
class SerialConsole
{
public:
SerialConsole();
~SerialConsole();
void TestPrint();
};
5) SerialConsole.cpp
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#include "SerialConsole.h"
SerialConsole::SerialConsole()
{
}
SerialConsole::~SerialConsole()
{
}
void SerialConsole::TestPrint()
{
Serial.println("Test Message");
}
If you saw it, there's a problem. "Serial" is undefined. But I'll solve this problem at next steps.
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6) Adding as a reference to Sketch1 Project
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7) Now, problem in step 5 is solved
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8 ) Time To Build !
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**ERROR 
**
SerialConsole.cpp: 11:2: error: 'Serial' was not declared in this scope
Serial.println("Test Message")
Error compiling libraries
Build failed for project 'Sketch1'
9 ) Add (#include "ESP8266WiFi.h") To SerialConsole.cpp and h
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and happy end
Build Success...
Compiling 'Sketch1' for 'NodeMCU 1.0 (ESP-12E Module)'
Program size: 249.059 bytes (used 24% of a 1.044.464 byte maximum) (2,63 secs)
Minimum Memory Usage: 33084 bytes (40% of a 81920 byte maximum)
