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Use Attributes to mark a method

You can add declarative information to a program by using an attribute. An attribute defines additional information that is associated with a class, structure, method, and so on. An attribute is supported by a class that inherits System.Attribute. All attribute classes must be subclasses of System.Attribute. This built-in attribute AttributeUsage specifies the types of items to which the attribute can be applied. using System.Diagnostics; class MainClass {     [Conditional("DEBUG")]     public void Validate()     {     } } C# defines three built-in attributes: AttributeUsage, Conditional, Obsolete.