communicate with serial port

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C++

Hi!
How can one transfer data through serial port to a microcontroller using visual C++. The microcontroller is running a C program (code warrier). My problem is that I can't send data to the microcontroller board. I tried a lot of things, but to no avail.
There is no error when compiling the program. Moreover, it doesn't anything transfer anything to the circuit board.

Thanks in advance.

private: System::Void FireRL3_button_Click(System::Object^  sender, System::EventArgs^  e) {
			
			Station szLogon;
			szLogon.StationID = Convert::ToByte("31"); //Convert.ToByte(tb1.Text);
			szLogon.StationCMD =(Byte)OP3FIRE;
			//szLogon.StationCMD  = (Byte)_outp(RL3FIRE,0x00);
			szLogon.StationMSG0 = 1;
			szLogon.StationMSG1 = 2;
			szLogon.StationMSG2 = 3;
			szLogon.StationMSG3 = 4;
			szLogon.StationMSG4 = 5;
			szLogon.StationMSG5 = 6;
			szLogon.StationMSG6 = 7;
			szLogon.StationMSG6 = 8;
			szLogon.StationMSG7 = 0;
			szLogon.EOD = 0x13;
			//
			//serialPort1->Read(StructureToByteArray(szLogon.StationID), 0, Marshal::SizeOf(szLogon.StationID));
			//_outp(00,00);
			 //Sleep(100);
			//serialPort1->DiscardOutBuffer();
			
			HANDLE hfile=CreateFile(TEXT("COM11"),GENERIC_WRITE|GENERIC_READ,0,NULL,OPEN_EXISTING,0,NULL);
		
			char buff[7];
			DWORD read=0;
			DWORD write=0;
			buff[0] =50;
			WriteFile(hfile,buff,write,&write,NULL);
			ReadFile(hfile,buff,sizeof(buff),&read,NULL);
			CloseHandle(hfile);
			SetTextBox(szLogon.StationCMD.ToString());
			//_outp(RL3FIRE,0x00);			
			//serialPort1->Write(StructureToByteArray(_outp(RL3FIRE,0)), 0, Marshal::SizeOf(szLogon.StationID));
			//serialPort1->Write(RL3FIRE.ToString());