Sure! I also had an urge to learn how to use Visual Basic with Arduino.
Look at this:
I wrote this with visual basic. You first drag the "SerialPort" object from the toolbox. Put this in the very beginning of the code:
Then in Public Class Form 1
insert the following code:
Dim WithEvents Arduinoport As SerialPort = New _
replace "COM5" with your desired port, 9600 with the desired baud rate.
Then, to send something to the serial port, use the following line:
Arduinoport.Write("the desired text")
good luck! Google is your friend.