This book is intended to explain everything about ADO.NET 3.5. ADO is a set of libraries used for data access, whether they are contained within a database, a spreadsheet or an XML file. ADO.NET is a data access technology that is based on the previous ADO objects (Acti veX Data Objects). It is a new way to access the data built on ADO; ADO.NET can coexist with ADO. This book is in charge of explaining all the possible ways of working with ADO.Net 3.5 using quick examples. In addition, it explains how to work with Connected and Disconnected Methods, with Stored Procedures, Using Wizard, Managing Crystal Report, with Data controls in ASP, with LinQ or Ado Entity, as well as connecting to other databases. Currently, ADO.NET is already part of the .NET Framework, this means that it is part of the operating system and no longer a redistributable that needs to be hosted by the client or by the installer of an application. This means that we, as developers, will be more focused on data access and the logic to manipulate this data, and we will not have to worry about client libraries.