C# .net developer interview questions

By | Mar 30, 2018

Some basic interview questions.

Its not comprehensive and ill extend this as needed.

Basics

  • In a loop you can use the terms continue and break. Explain the differences.
  • What are design patterns
    • Give examples of behavioral and structural pattern.
  • Name the different types of access modifiers you get in C#.
  • What is the point of the protected access modifier?
    • Explain encapsulations.
    • Explain what the virtual keyword is used for.
    • Explain what the abstract keyword is used for.
  • Name an Immutable type.
  • What is the difference between a Value type and a reference type.
  • What is the difference between an Object and a Class.
  • Where would you use an Abstract class instead of an Interface?
  • What is inheritance?
    • Does C# support multi-Inheritance?
    • Explain Polymorphism
  • What is the difference between constants and static.
  • What is a sealed class?
  • What is a namespace?
  • What is an event?

Intermediate

  • Where would you use the IDisposable interface?
  • Where would use the using clause?
  • Can a static class have a constructor?
  • What is the difference between Try, Catch and Try, Finally?
  • What is the difference between Throw and Throw ex?
  • What is a Tupel?
  • What are the benefits of the bridge pattern?
  • What is the GAC?
    • Why do we need the GAC?
  • What is GC in .net?
    • Explain how the garbage collector work.

Concepts

  • What is class explosion?
  • What is coupling?
  • What is separation of concerns?
  • What is parallel processing?

Architectural

  • What is the difference between layers and tiers.
  • What is SOA?

Infrastructure

  • What is the difference between hosting in the web and hosting in the cloud?
  • IAAS vs PAAS

Security

  • What is SQL injection and how do you prevent it?
  • What is a SSL certificate?
  • How would I protect my code from people that would like to reverse engineer our code.

Opinion check of person

  • Is C# better than VB.net or Delphi.net
  • Is it a good idea to comment your code or is there another way?
  • Why do we need coding standards?
  • Do you think design patterns are still needed?
  • Is designing for code-reuse good or bad?
    • Is coupling good or bad?

Advance

  • How would you design a library so that it can be extended or changed without having to alter the existing code.
  • Explain the difference between a constant and a read only variable.
  • What is the Stack?
    • What does it mean if you get a Stack overflow?
  • What is the point generics?
    • Does generics support Inheritance?
  • How would you change the default way C# compares the equality of two instances?
  • Where would you use the observer pattern?
  • Name the different types of collections you get in .net.
    • What is the difference between a Queue and a Stack.

 

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