Connect Data ADO NET—ADO NET Overview

http://en.csharp-online.net/Connect_Data_ADO_NET%E2%80%94ADO_NET_Overview

ADO.NET is the part of the .NET Framework that connects applications to data sources and lets you retrieve and update the contained data. ADO.NET supports a variety of different data sources, including relational databases such as Microsoft SQL Server, Oracle, and Microsoft Access, as well as other data sources such as Microsoft Excel, Outlook, and text files.