If a “Utilities” class is evil, where do I put my generic code? [closed]

Answer 1

If this is an operation on an IList, then it should be an extension method on IList.

Generally, Utils and Helper type classes should be avoided. More often than not, you will find that what you may think is a utility method, is actually a rather specific method that probably belongs in a class of its own (just like you say). However, there will be domain specific cases where Util-like classes (classes which group related useful methods) are valid entities.