Interfacing Arduino with C++

Hey! Just trying to send instructions to the arduino serial port with Visual Studio... I found this useful (Arduino Playground - CPPWindows) and followed the example at the bottom. I can establish connection to the serial port, but cant get the led to blink. By the way, what is this going to do :

 this->serialPort1->Write( "7" );

They say that: " The LED on the Arduino board should blink the same number of times as the number you entered in the Write statement above, only if it's from 1-9. "
So what does SerialPort->Write() do ?

EDIT: Sorry, this is built on the example serial_read_blink.pde, so i need to run the program first on the arduino -.- Such an idiot...