Robot

I am trying to make a robotic arm controller in visual basic. The computer will communicate with the robot via serial cable. How can I send a signal through the serial port to a servo controller? Is Visual Basic a good choice for this task? I also know some C++ but I much rather use VB if possible. The pins that I need to send the signal through are pin 2 and 3 and pin 5 is the ground. Does any one have any ideal on how I can do this?

In the 101 .NET Tutorials download from MS there is a demo project on how to interact with the COM ports.
Should be a good place to start.