
I know that there is already a very nice .net class to communicate to Arduino via the Firmata protocol. But!
unfortunately this protocol has no support for the use of character LCD.
So i decided to develop my own Sketch and .NET Class so i can create projects involving I/O and LCD.
This is a very EASY TO USE class for beginners and advanced .NET Developers.
The link below will download the Class and Sketch. that is all you need
to start using Arduino!
http://www.4shared.com/get/LMaSj7lS/Visual_Arduino.html
I also included a very nice set of User Controls Switchs you can use in your project.

You can download this controls with the link below.
http://www.4shared.com/get/aBcSf5ll/Real_Switches.html
Notes:
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This Class has no support for servo motors YET! that's because i don't have a servo motor.
I will add a servo support as soon as i will own one... (Very soon). -
The "digital Message Receive" Event Raises on a seperate thread.
so if you want to update your form controls inside the event procedure add the line:
CheckForIllegalCrossThreadCalls = False at the form Load Event. -
The Class Developed for the use of Arduino Duamilanove 328 boards but i guess it will work on other boards too.
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The Class supports for a maximum of 13 digital pins.
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Using The LCD support requires you to enable the LCD Engine from the sketch file by removing the "//"
from the start of the line : // LiquidCrystal lcd(lcdRS,lcdEN,lcdDB11,lcdDB12,lcdDB13,lcdDB14); -
Also change the Pin Number Constants in the sketch according to your project.