ASP.NET Tutorial/ADO.net Database/Introduction

Interfaces for Standard ADO.NET Objects

Type of Object      Base Class        Example           DbProviderFactory Method 
Connection         DbConnection      SqlConnection     CreateConnection()
Command            DbCommand         SqlCommand        CreateCommand()
Parameter          DbDataParameter   SqlParameter      CreateParameter()
DataReader         DbDataReader      SqlDataReader     CreateDataReader()
DataAdapter        DbDataAdapter     SqlDataAdapter    CreateDataAdapter()