There are many Object-Relational Mapping (ORM) solutions for the Microsoft .NET Framework. This PDF document compares the Microsoft ORM products LINQ-to-SQL and ADO.NET Entity Framework with the largest Open Source ORM (nHibernate) and three commercial products (Open Access, Genome and NDO). The comparison also includes Typed DataSets, which are not an ORM in a strict sence, however very often compete with ORM tools in .NET projects.
Comparison of Object-Relational-Mapping Tools (ORM) for the .NET Framework