In c#, the attribute’s information for a Class can be retrieved at

Attributes are a new kind of declarative information. We can use attributes to define both design-level information (such as help file, URL for documentation) and run-time information (such as associating XML field with class field). We can also create "self-describing" components using attributes. In this tutorial we will see how we can create and attach attributes to various program entities, and how we can retrieve attribute information in a run-time environment.