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What Are The Top 10 .NET Interview Questions?

Updated: Nov 23, 2020

  1. What is the .NET framework?

  2. What is CTS?

  3. What is CLS?

  4. What is CLR?

  5. What is ASP .NET?

  6. What is encapsulation?

  7. What is the difference between a class and an object?

  8. What is a .NET Web Service?

  9. How do .NET developers commonly use JSON?

  10. What is the difference between unmanaged and managed code?

The .NET framework has quickly become one of the most used frameworks in the United States and the second most popular worldwide. It's Windows-based and is compatible with a wide range of programming languages ranging from VB .NET, C#, Perl, Cobol, etc. That make .NET the framework of choice for many application development environments. 

While no list could include every possible question you may be asked during a .NET interview, here we have collected the 10 most common questions we typically hear during .NET interviews. 

Q 1. What is the .NET framework?

.NET is a windows platform for developers to build applications on. It supports the object-oriented programming (OOP) model and a variety of programming languages including C#, Cobol, VB, Perl, and more. 

Q2. What is CTS?

CTS is an acronym for Common Type System. CTS determines how a data type should be used in a program. It’s designed to allow data types declared in one programming language to be called by a program using another language. 

Q3. What is CLS?

CLS is an acronym for Common Language Specification. CLS forces programmers to use components that are compatible across different programming languages within .NET.

Q4. What is CLR?

CLR is an acronym for Common Language Runtime and is one of the most important aspects of .NET. CLR provides a stable execution environment. Once an application is compiled it’s converted and sent to CLR before execution.

Q5. What is ASP .NET?

ASP is an acronym for Active Server Pages. It is an open-source, server-side component of the .NET technology that allows developers to create web apps, sites, and services. 

Q6. What is encapsulation?

Encapsulation binds data and code in an object to prevent unwanted access. This makes objects less likely to be modified by other objects in the application. 

Q7. What is the difference between a class and an object?

A class contains the behavior and data of an object. An object is a single instance of a class. The properties and states common across multiple objects are defined by it’s class. 

Q8. What is a .NET web service?

Web services use standard protocols (e.g. XML, SOAP, HTTP) to make components accessible and reusable online. It enables different applications to communicate despite using different languages and platforms. 

Q9. How do .NET developers commonly use JSON?

JSON allows developers to use stored and organized data made available by other sites. RSS and SML feeds are similar but tend to be slower and more complex to use than JSON in the .NET environment. 

Q10. What is the difference between unmanaged and managed code?

Unmanaged code does not run in the CLR when compiled whereas managed code does. This means that managed code does not can use any platform as it’s relying on the CLR instead of the operating system.


While preparing for a .NET interview it would be impossible to memorize every possible question that may be asked. Because .NET is so widely used, and compatible with so many different languages, the possible questions a hiring manager may ask are nearly infinite. These questions, however, are extremely common so the better you understand them, the more likely you are to nail your next .NET interview!

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