C# .NET - Should i write the Dispose method for user defined class explicitly?

Should we write the dispose method for user defined class?
How the clr disposes user defined class objects?

thank you
nagaraj

When there is some non-managed reference to dispose - database connections, file handles, and so on -- or if you have a reference to a library that implements IDisposable.

Most user-defined classes DO NOT need to implement IDisposable.

thank you very much , I got it

Nagaraj