Array Conversions in C#

ref keyword in the methods is unnecessary, and should be removed. Even if you weren't just printing values, arrays are already sent by reference, so I can't really see the reason behind ref keyword. You should only use ref keyword when you want the reference in the calling function to change. In your example, the only reason you would want to use a ref keyword is when you want the myIntArray in main to change to null after calling a method. I suggest you read this excellent article about parameter passing: http://www.yoda.arachsys.com/csharp/parameters.html by Jon Skeet