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ADO.NET

100 ADO.NET interview questions

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ADO.NET Fundamentals


  • 1.

    What is ADO.NET and what are its main components?

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  • 2.

    How does ADO.NET differ from classic ADO?

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  • 3.

    What is the role of the DataSet in ADO.NET?

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  • 4.

    Explain the differences between DataSet and DataReader.

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  • 5.

    What are the key classes in ADO.NET?

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  • 6.

    What is the use of the Connection object in ADO.NET?

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  • 7.

    How do you handle transactions in ADO.NET?

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  • 8.

    Describe the Connection Pooling in ADO.NET and how it can be configured.

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  • 9.

    What is the purpose of Command objects in ADO.NET?

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  • 10.

    Can you explain what a DataAdapter does in ADO.NET?

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  • 11.

    What is a DataRelation object in a DataSet?

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  • 12.

    How do you filter and sort data in a DataSet?

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ADO.NET Advanced Features


  • 13.

    What is a DataProvider and how do you choose one?

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  • 14.

    Can you define what a Parameterized Query is in ADO.NET?

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  • 15.

    Explain how to implement optimistic concurrency in ADO.NET.

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  • 16.

    Describe how to use the SqlBulkCopy class.

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  • 17.

    What are Typed and Untyped DataSets?

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  • 18.

    Explain the process of updating a database with changes from a DataSet.

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  • 19.

    Describe how to handle NULL database values in ADO.NET.

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  • 20.

    What is the role of the Entity Framework in ADO.NET?

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  • 21.

    How do you use Transactions with a DataAdapter?

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  • 22.

    What is a Connection String and what are the common parameters that it may contain?

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ADO.NET Connection and Command


  • 23.

    How do you open and close a database connection in ADO.NET?

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  • 24.

    Explain the ExecuteNonQuery, ExecuteScalar and ExecuteReader methods of the Command object.

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  • 25.

    What is the purpose of the IDbConnection and IDbCommand interfaces?

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  • 26.

    Discuss how CommandBehavior affects the behavior of data readers.

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  • 27.

    What are the differences between ExecuteScalar, ExecuteReader, and ExecuteXmlReader?

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  • 28.

    How do you create and use a stored procedure with ADO.NET?

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  • 29.

    What are prepared statements and how do you use them in ADO.NET?

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ADO.NET DataAdapter and DataSet


  • 30.

    How does a DataAdapter manage the connection to a data source?

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  • 31.

    Explain the Fill method of DataAdapter and how it populates a DataSet or DataTable.

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  • 32.

    How do you update the underlying data source with changes in a DataSet?

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  • 33.

    What is a DataSet schema and how is it created and used?

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  • 34.

    How can you merge contents of two DataSets?

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  • 35.

    Discuss ways to improve the performance of DataSet objects.

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  • 36.

    How do you ensure that your ADO.NET application is scalable?

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ADO.NET Transaction and Concurrency


  • 37.

    What is an Isolation Level in transactions? List the different types.

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  • 38.

    Describe the difference between pessimistic and optimistic concurrency control.

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  • 39.

    How can you implement batch updates in ADO.NET?

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ADO.NET with XML


  • 40.

    Explain how ADO.NET interacts with XML.

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  • 41.

    What is an XML Schema Definition (XSD) and how can it be used with ADO.NET?

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  • 42.

    How do you read and write XML data with ADO.NET?

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ADO.NET Exceptions and Error Handling


  • 43.

    How do you handle exceptions in ADO.NET?

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  • 44.

    What are the common exceptions you might encounter when using ADO.NET and how do you handle them?

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  • 45.

    How do you perform error logging in ADO.NET applications?

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ADO.NET Best Practices


  • 46.

    What is the recommended way to secure your ADO.NET connection strings?

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  • 47.

    What are the best practices for using ADO.NET in high-performance applications?

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  • 48.

    How can you minimize the use of resources when working with ADO.NET?

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  • 49.

    Can you explain the use of Using statement in connection and command objects?

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  • 50.

    What are some common performance considerations when using ADO.NET?

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ADO.NET Data Types and Constraints


  • 51.

    What is the difference between a DataSet and a DataTable?

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  • 52.

    How do you add a new DataColumn to a DataTable?

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  • 53.

    Describe the role of the DataView in ADO.NET.

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  • 54.

    What are the constraints in a DataSet and how do they work?

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  • 55.

    What data types can be used within a DataTable?

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ADO.NET Data Relationships


  • 56.

    How do you define a relationship between tables in a DataSet?

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  • 57.

    What is a ForeignKeyConstraint and how do you use it in ADO.NET?

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  • 58.

    Describe how to navigate through master-detail records in a DataSet.

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ADO.NET and LINQ (Language Integrated Query)


  • 59.

    What is LINQ to DataSet and how do you use it?

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  • 60.

    How do LINQ queries differ when used with DataSet vs. DataReader?

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  • 61.

    Explain the role of DataContext in LINQ to SQL.

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  • 62.

    Describe how you would perform a join between two DataTables using LINQ.

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ADO.NET Asynchronous Operations


  • 63.

    How do you perform asynchronous data operations in ADO.NET?

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  • 64.

    Explain the impact of async/await keywords on database operations.

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  • 65.

    What methods support asynchronous execution in SqlCommand?

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Interacting with Different Databases


  • 66.

    How would you switch between different database systems using ADO.NET?

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  • 67.

    What changes might be required when moving from a SQL Server database to Oracle using ADO.NET?

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  • 68.

    Can you explain how to use ADO.NET with a MySQL database?

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ADO.NET Entity Framework


  • 69.

    How does ADO.NET Entity Framework differ from ADO.NET?

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  • 70.

    What is the Code First approach in Entity Framework and how does it work with ADO.NET?

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  • 71.

    Explain the Database First approach in Entity Framework.

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  • 72.

    What are Entity Framework migrations and how do they integrate with ADO.NET?

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Advanced ADO.NET Techniques


  • 73.

    How do you handle bulk insert operations with ADO.NET?

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  • 74.

    Can you explain the use of Table-Valued Parameters in ADO.NET?

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  • 75.

    Describe the process of implementing a Custom Data Provider for ADO.NET.

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  • 76.

    How do you implement Full-Text Search queries within ADO.NET?

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ADO.NET Performance Tuning


  • 77.

    What are some methods to profile and tune the performance of ADO.NET applications?

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  • 78.

    How would you use caching to enhance the performance of an ADO.NET application?

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  • 79.

    What are some common anti-patterns that degrade ADO.NET performance?

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ADO.NET Security


  • 80.

    Discuss the security considerations when using ADO.NET to connect to a database.

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  • 81.

    How do you use Windows Authentication with ADO.NET?

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  • 82.

    Explain how to encrypt sensitive ADO.NET configuration information.

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  • 83.

    What is SQL Injection and how can ADO.NET help prevent it?

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ADO.NET Integration and Interoperability


  • 84.

    How do you integrate ADO.NET with other .NET Framework components?

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  • 85.

    Can ADO.NET interact with RESTful services, and if so, how?

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  • 86.

    How does ADO.NET support interoperability with non-.NET languages?

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ADO.NET Deployment and Configuration


  • 87.

    What are the considerations for deploying an ADO.NET application?

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  • 88.

    How do you manage database connections and perform versioning in a deployment scenario?

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  • 89.

    Describe the process of using ADO.NET in a multi-tier application architecture.

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ADO.NET and Transaction Management


  • 90.

    What is System.Transactions namespace and how does it relate to ADO.NET?

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  • 91.

    Explain distributed transaction management with ADO.NET.

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ADO.NET Object-Relational Mapping (ORM)


  • 92.

    Define Object-Relational Mapping (ORM) as it pertains to ADO.NET.

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  • 93.

    How does ADO.NET fit into an ORM strategy?

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ADO.NET Diagnostic and Troubleshooting


  • 94.

    How do you troubleshoot connectivity issues in ADO.NET?

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  • 95.

    What tools can be used for diagnosing problems in an ADO.NET application?

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ADO.NET Extensibility


  • 96.

    How can you extend the functionalities of ADO.NET?

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  • 97.

    What options does ADO.NET provide for custom data serialization?

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ADO.NET and .NET Framework Integration


  • 98.

    How does ADO.NET interact with other .NET namespaces and functionalities?

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  • 99.

    How do you handle data concurrency in .NET applications using ADO.NET?

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Modern ADO.NET Uses and Practices


  • 100.

    Describe how modern .NET development practices (like .NET Core and .NET 5/6+) have affected the use and evolution of ADO.NET.

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