I was told by my colleague based on one of my classes (it is an instance class) that if you have no fields in your class (backing fields), just make all methods static in th
It sounds like you're talking about a strictly Utility class, in which case there's really no reason to have seperate instances.
Make those utility methods static. You can keep the class as a regular object if you'd like (to allow for the future addition of instance methods/state information).