.NET Interview Questions – How does ‘DataSet’ differ from ‘SQLDataReader’ in ADO.NET?

In this question the interviewer is expecting two points the first point is dataset is a connect architecture and datareader is a disconnected architecture. Let’s discuss both these points in detail.

Point 1:- ‘DataSet’ is a Disconnected Architecture while ‘DataReader’ is a Connected Architecture.

In order to understand that, below is the sample code for ‘DataSet’ where you can see even after calling the “ObjConnection.Close()” the ”Foreach Loop” is still running. This indicates that the ‘DataSet’ works in Disconnected Architecture.

Similarly, below is the sample code for ‘DataReader’ where you can see that when “ObjConnection.Close()” is called then the “While Loop” does not execute and throws an error. This indicates that the ‘DataReader’ works only in Connected Architecture.

Point 2:- ‘DataSet’ is an in memory representation of database by itself whereas ‘SQLDataReader’ is a flat row and column.

Dataset is an in-memory database with database, tables, columns and rows. While data reader is a flat table with just rows and columns

If you see the dataset object in your visual studio intellisense you should see the complete object hierarchy as shown in the below figure.

If you see the ‘sqldatareader’ in intellisense , its flat table with rows and columns as shown in the below image.

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Regards,

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This blog is for developers who want to crack .NET and C# interviews. It has all tips and tricks needed to crack .NET interviews , C# interview , SQL Server interview , Java interview , WCF Interview , Silverlight interview , WPF interview , LINQ interview , Entity framework Interview. Do not forget to watch our Learn step by step video series. Learn MVC in 16 hours:- https://www.youtube.com/watch?v=Lp7nSImO5vk Learn AngularJS Step by Step:- https://www.youtube.com/watch?v=0kmdjqgO9IY Learn Design Pattern in 8 hours:- https://www.youtube.com/watch?v=YDobmucohqk Learn C# and .NET in 60 days:- https://www.youtube.com/watch?v=yh2SrzCkNQA Learn MSBI in 32 hours:- https://www.youtube.com/watch?v=mGPJx3ocFgg Learn SharePoint Step by Step in 8 hours:- https://youtu.be/C2fW76SwJNU
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