Verifies that the object a data-bound control binds to is one it can work with.
Assembly: System.Web (in System.Web.dll)
The object passed by the dataSource parameter is not null or a recognized type.
The method is only called in the BaseDataBoundControl class's mutator (set accessor) for the DataSource property. The DataBoundControl class checks the type of the object that is set for the DataSource property to ensure that it is an instance of the IDataSource, IListSource, or IEnumerable interface.