Use Attributes to mark a method : Attribute « Attribute « C# / CSharp Tutorial

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2. Attribute
3. Attribute

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.

1. An attribute is supported by a class that inherits System.Attribute.
2. All attribute classes must be subclasses of System.Attribute.
3. 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:

1. AttributeUsage,
2. Conditional,
3. Obsolete.