P2p Chat Using Visual C

At the beginning I was going to make my P2P chat project using pure C/C++ (black console). But we were informed that we can use visual C. So I have a question

// adad.cpp : main project file.#include "stdafx.h"#include "Form1.h"using namespace adad;[STAThreadAttribute]int main(array<System::String ^> ^args){	// Enabling Windows XP visual effects before any controls are created	Application::EnableVisualStyles();	Application::SetCompatibleTextRenderingDefault(false); 	// Create the main window and run it	Application::Run(gcnew Form1());	Form1 a;	return 0;}

How do I make Form1 a appear? putting it in the Application::Run command gives the following error

Error	1	error C2665: 'System::Windows::Forms::Application::Run' : none of the 3 overloads could convert all the argument types	c:\Users\pc\Documents\Visual Studio 2005\Projects\adad\adad\adad.cpp	18

Also an advice, I haven't used visual before so what best type would suit a P2P chat (similar to IRC) project? I am going with Windows Forms Application.
My basic idea is:

Main page:
Username/Password/Login button/Signup button
Sub pages:
Login successful / Registration forum etc...
Key pages:
Listing all active accounts and active chats. When you click on chat/account you start chatting ( a special form for chatting is shown)

Is such a thing possible in one application?

Note: This is a big project, so I can't use any 3rd party or any premade libraries that provide with the functions for visual P2P chat, I have to make everything. And so far, it's going well 8)