Accessing metadata

Question

Hi, I will be starting on a project which involves connecting an oracle database to .NET. One of the primary tasks will be to access the metadata of the database and display it in a tree view on a window form. 1) How can I access the metadata through ADO.NET and use it? 2) Is it also possible to access metadata information about primary keys, foreign keys etc.? I will greatly appreciate the suggestions. Thanks in advance. Diya