How to merege n files from directory to one txt file ?

copy *.* output.txt

How to create windows forms application using visual studio 2015 c++ ?

1. Create new project: CLR Empty Project ?
2. Add new item: UI -> Windows Form
3. Set this options in project properties: Configuration Properties -> Linker -> System -> SubSystem -> WINDOWS (/SUBSYSTEM:WINDOWS); Configuration Properties -> Linker -> Entry Point: main
4. Your form .cpp file you should look like this:
   
   -------------------------------------------------------------
   #include "MyForm.h"
   
   using namespace System;
   using namespace System::Windows::Forms;
   
   [STAThread]
   void main(array^ args)
   {
      Application::EnableVisualStyles();
    Application::SetCompatibleTextRenderingDefault(false);
    mach2gamessnake::MyForm form;
    Application::Run(%form);
   }
   -------------------------------------------------------------
   

How to create remote Git repository in Visul Studio using visualstudio.com ?

[Attention: This is not full description]
1/ Create online repository
2/ Connect to repo from Visual Studio
3/ Clone repo locally to empty folder
4/ Create solution under repo control (add manually or create from TeamFoundation tab)