.NET Framework ADO.NET
Introduction
ADO(ActiveX Data Objects).Net is a tool provided by Microsoft which provides access to data sources such as SQL Server, Oracle, and XML through its components. .Net front-end applications can retrieve, create, and manipulate data, once they are connected to a data source through ADO.Net with appropriate privileges.
ADO.Net provides a connection-less architecture. It is a secure approach to interact with a database, since, the connection doesn't have to be maintained during the entire session.
Remarks
A note on parameterizing SQLs with Parameters.AddWithValue: AddWithValue is never a good starting point. That method relies on inferring the type of the data from what is passed in. With this, you might end up in a situation where the conversion prevents your query from using an index. Note that some SQL Server data types, such as char/varchar (without preceding "n") or date do not have a corresponding .NET data type. In those cases, Add with the correct data type should be used instead.
