In this blog post, I will share frequently asked oops interview questions c# and c# interview questions and answers for experienced professionals/developers candidates to get the right job. Find the list below:-

• Keep reading on Interview Questions on .NET Framework, Interview Questions on ASP.NET MVC

OOPs Interview Questions in C#

Introducing C#.Net

• What is C#?
• What features are added to different versions of C#?
• What is Dynamic binding?
• What are Optional parameters?
• What is Type variance?
• What are Asynchronous Methods?
• Explain the C# code execution process?

Data Types and Operators

• What is Datatype?
• What do you mean by value type and reference type?
• What are Nullable types? How to use Nullable types in .NET Framework?
• How to check that a nullable variable is having value?
• What are the differences between int, Int16, Int32, and Int64?
• What is ?? Operator in C#?
• What are dynamic types in C#?
• What are the differences between Object, Var and Dynamic type?
• What is the ref and out keyword in C#?
• Can you use out and ref for overloading as the different signature of method?
• What is the params keyword in C#?
• What do you mean by operators and what are different types of operators in c#?
• What is the operator precedence in C#?
• What is a ternary operator (?:) in C#?
• What are the differences between Constant, ReadOnly and Static?
• What is a safe and unsafe code?
• What is Type Casting or Type Conversations?
• What are the different types of Type Casting supported in C#?
• How to do safe type casting in C#?
• What are Upcasting and Downcasting?
• What are Boxing and Unboxing?

Array and Strings

• What do you mean by an Array?
• Explain different types of arrays in C#?
• What is the Array class in C#?
• What is string array in C#?
• What is the difference between System.String and System.Text.StringBuilder classes?
• What is a verbatim string?

Class and Object

• What do you mean by Class?
• What do you mean by Object?
• What is Constructor?
• What are the different types of constructors?
• What is a static Constructor?
• Why static Constructor has no parameter?
• Why you can have only one static constructor in a class?
• What is a Private Constructor?
• When you create a child class object, which class constructor will be called first?
• What is Destructor?
• What is finalize() method?
• What are the similarities and differences between finalize and destructor?
• What is the use of “using” statements in C#?
• What is Access Modifier?
• Explain different types of access modifiers in C#?
• Can a child or derived type have higher accessibility form its parent type?
• Can you declare struct members as protected?
• Can you explain the member’s accessibility?
• Can destructors have access modifiers?
• While inheriting a class do the private members get inherited?
• What is Enum?
• When to use an Enum?
• What is a structure in C#?
• When to use structure?
• What are the similarities between a class and a structure?
• What is the difference between class and structure?
• What is a static class?
• When to use a static class?
• What are static members?
• What is a Static Method?
• What are the differences between static and instance methods?
• What are Sealed Classes in C#?
• What is the base class in .NET Framework from which all the classes are derived?
• What is a partial class, interface or struct?
• What are the advantages of partial?
• What is the partial method?
• When to use partial methods?

Exception Handling

• What is Error?
• Explain different types of errors?
• What are Exceptions?
• What are the different types of Exceptions?
• What is the role of System.Exception class?
• What are the various predefined exceptions classes?
• What is Exception Handling?
• What is the order of try-catch-finally blocks?
• Can you have a catch block without a try block?
• Can you have a try block without a catch block?
• Can multiple catch blocks be executed?
• What are user-defined Exceptions in C#?
• What do you understand by Custom Exceptions?

Reflection and Serialization

• What is Reflection?
• How to use Reflection in C#?
• When to use Reflection?
• What are Serialization and Deserialization?
• When to use serialization and deserialization?
• What namespace is used to support Serialization in .NET?
• What are Serializable and NonSerialized attributes?
• What are the different types of Serialization?
• What namespace is used for SOAP Serialization?
• What is Custom Serialization?

Property and Indexer

• What is Property?
• When to use the property?
• What are the different types of properties?
• What is auto-implemented property?
• When to use the auto-implemented property?
• What is static Property?
• What is abstract Property?
• What is Indexer in C#?
• Which one to choose between Property and Method?
• What are the differences between Property and Indexer?

Abstract Class and Interface

• What is an Abstract Class?
• How to create an abstract class in C#?
• When to create an abstract class?
• What are the common design guidelines for an abstract class?
• What is an interface and how to use it?
• When to use an interface?
• What are the disadvantages of an interface?
• What are the common design guidelines for the interface?
• How can you achieve multiple inheritances (implementation) using interfaces?
• What is the difference between an interface and an abstract class?

Delegates and Events

• What are the Delegates?
• What are the steps to create a Delegate?
• What are the different types of delegates?
• What are Events?
• How to define an Event or Event Handler?
• What are the differences between Events and Delegates?
• Do Events have a return type?
• Can Events have access modifiers?
• What is an Attribute?
• Can you explain some built-in attributes?
• How to show a message in your latest version of code about your old method removal?
• How to create a custom attribute class?

Collections and Generics

• What are Collections?
• What are the various collections in C#?
• What are Generics in C#?
• What are the advantages of generics?
• What are various Generic Collections in C#?
• What is the name of the namespace for collections in C#?
• What are the differences between Generic Collections and Non-Generic Collections in C#?
• What are Concurrent Collections?
• What is the name of the namespace for concurrent collections in C#?
• What is a base interface for all the collections?
• What are collection interfaces in C#?

Threading

• What are the thread and processes?
• What is Thread Synchronization?
• Explain the Thread life cycle?
• What is Multithreading in C#?
• What is a Thread Pool?
• What namespace is used for Threading?

References: Stack Overflow (c# advanced interview questions)

Conclusion

I hope you liked this article on the C# Oops interview questions for experienced professionals and freshers. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.

The post C# Interview Questions for Experienced Professionals appeared first on DotNetTec.