What is the best way to dispose COM object in C#

You can implement IDisposable in your class as below reference example. You can also use the destructor to call the Dispose method since the object can sometimes be deleted by the GC. public class User : IDisposable { public int id { get; protected set; } public string name { get; protected set; } public string pass { get; protected set; } public User(int userID) { id = userID; } public User(string Username, string Password) { name = Username; pass = Password; } // Other functions go here... public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (disposing) { // free managed resources } // free native resources if there are any. } }