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What is the full form of ADO?
The full form of ADO is ActiveX Data Object.

Explain ADO.NET in brief.
ADO.NET is a very important feature of .NET Framework, which is used to work with data that is stored in structured data sources, such as databases and XML files. The following are some of the important features of ADO.NET:
  • Contains a number of classes that provide you with various methods and attributes to manage the communication between your application and data source.
  • Enables you to access different data sources, such as Microsoft SQL Server, and XML, as per your requirements.
  • Provides a rich set of features, such as connection and commands that can be used to develop robust and highly efficient data services in .NET applications.
  • Provides various data providers that are specific to databases produced by various vendors. For example, ADO.NET has a separate provider to access data from Oracle databases; whereas, another provider is used to access data from SQL databases.

What are major difference between classic ADO and ADO.NET?
Following are some major differences between both
  • In ADO we have recordset and in ADO.NET we have dataset.
  • In recordset we can only have one table. If we want to accommodate more than one tables. We need to do inner join and fill the recordset. Dataset can have multiple tables.
  • All data persist in XML as compared to classic ADO where data persisted in Binary format also.

What are the two fundamental objects in ADO.NET?
DataReader and DataSet are the two fundamental objects in ADO.NET.