Managed C++/CLI

vector<wstring> files;
	wstring directory =(L"C:\\Windows\\system32");		
	if (ListFiles(directory, L"*", files)) 
	{    
		for (vector<wstring>::iterator it = files.begin(); it != files.end(); ++it)     
		{        
            keepname  = WStringToString(it->c_str());
			searchkmp();
			int index = listBox1->Items->Add(String::Concat(gcnew String(it->c_str())));        
			listBox1->SelectedIndex = index; 
			count++;
			listBox1->Update();


		}
	}</wstring></wstring>

MainForm^ mainform = gcnew MainForm();
Application::Run(mainform);
mainform->txtUpdates->Text = "test";

#include "Form Child.h"

namespace Delegates {


	public delegate void AddTextChangeDelegate(String^ item);
	
	public ref class FormMain : System::Windows::Forms::Form
	{
	public:
		FormMain()
		{
			formChild = gcnew FormChild();
		}

	// declare as global variable	
	private:
		FormChild^ formChild;

	private: 
		System::Void button1_Click(System::Object^  sender, System::EventArgs^  e)
		{			
			formChild->AddTextChangeCallback = gcnew AddTextChangeDelegate(&this->AddTextChangeCallbackFn);
			formChild->Show();
		}

	private:
		System::Void AddTextChangeCallbackFn(String^ str)
		{
			textBox1->Text = str;
		}
	};
}

namespace Delegates {
	
	public ref class FormChild : System::Windows::Forms::Form
	{
	// declaring delegate, and get "error C2143: syntax error : missing ';' before '^' "
	// the compiler seems doesn't recognize this
	public:
		AddTextChangeDelegate^ AddTextChangeCallback;
	
	// user click add button and the delegate executed
	private:
		System::Void btnAdd_Click(System::Object^ sender, System::EventArgs^ e)
		{
			AddTextChangeCallback(textBox1->Text );
		}
	
	};
}

#include "StdAfx.h"
#include "Form Child.h"
#include "Form Main.h"

System::Void FormChild::btnAdd_Click(System::Object^ sender, System::EventArgs^ e)
{
	
	FormMain^ formMain = gcnew FormMain();
	formMain->textBox1->Text = this->textBox1->Text;
	// I also have change it to this but the FormMain textBox1's text doesn't change
	// FormMain formMain;
	// formMain.textBox1->Text = this->textBox1->Text;
	// this will give memory access error in the runtime
	// FormMain^ formMain;
	// formMain->textBox1->Text = this->textBox1->Text;
}