How does COM+ Object pooling works in Visual Basic .NET?
Components that are developed using Visual Basic 6.0 cannot be pooled because COM+ object pooling requires multi-threaded apartment (MTA) components, and Visual Basic 6.0 components use the single-threaded apartment model. However, a Visual Basic 6.0 application can detect whether an object can be pooled or not, using the IObjectControl interface. In Visual Basic 6.0, the ObjectControl class provides the same functionality as IObjectControl. In Visual Basic .NET, the ServicedComponent class in the System.EnterpriseServices namespace provides similar functionality. Therefore, a Visual Basic .NET class that inherits from ServicesComponent is capable of pooling. To make an object poolable, decorate the class with the ObjectPooling attribute and add a reference to the System.EnterpriseServices namespace. Also, pooled objects may only run in server applications — they may not be configured to run as a library.
