Which is the better name for a method that returns a boolean?IsSupportContentTypeorCanSupportContentType
Naming of bool methods: Is vs. Can vs.?
naming;naming standards
Is vs. CanAccording to the Microsoft naming convention recommendations, both Is and Can are OK (and so is Has) as a prefix for a Boolean.In plain English, Is would be used to identify something about the type itself, not what it can do.  For example, IsFixed, IsDerivedFrom, IsNullable can all be found in CLR types and methods.  In all of these cases, Is is followed by an adjective.Meanwhile, can more clearly indicates a capability, e.g. CanEdit, CanRead, CanSeek.  In each of these cases, can is followed by a verb.  Since Support is a verb, I think in your case CanSupportContentType is better.Shorter alternativeOn the other hand, the conventions say the prefix is optional.  What's more, it's kind of cheesy to include the argument type in the method name, since a developer can see the type of the argument in intellisense.  So you could just name your method Supports and define it like this:public bool Supports(System.Net.Mime.ContentType contentType)...which is shorter and still clearly communicates the purpose.  You'd call it like this:ContentType contentType = new ContentType(text/plain);var someClass = new MediatorsClass();bool ok = someClass.Supports(contentType);Or as a compromise maybe this is best:public bool CanSupport(System.Net.Mime.ContentType contentType)