does a c# cross compiler exist?

Projects General Guidance
1

does a c# cross compiler exist for arduino/netduino

2

If I recall correctly the Netduino works with .NET and is C# programmable.

The FEZ Panda definitely is - www.tinyclr.com -

The Arduino is not C# compatible, but if you know C# well it is not difficult to learn to program the Arduino .

3

arduino/netduino

The only thing in common between the Arduino and Netduino are the letters "duino."

4

The only thing in common between the Arduino and Netduino are the letters "duino."

No they also share pinlayout so shields can be used on both , see picture - Netduino - DEV-10107 - SparkFun Electronics -