I have created a public static class utils.cs I want to use it in other classes without prefixing method with utils, what\'s the syntax to do this ?
There's no way of doing this in C# - no direct equivalent of Java's static import feature, for example.
For more information about why this is the case, see Eric Lippert's post on the topic and a similar SO question.
In certain circumstances, however, it may make sense to write extension methods which live in non-nested static classes but "pretend" to be instance methods of a different class. It's worth thinking carefully before you introduce these, as they can be confusing - but they can also improve readability when used judiciously.
What sort of utility methods were you thinking of?