C# Job Interview Questions

What is a 'protected' keyword used for in C# and what other keyword is very closely related to it??

C# Mid-level
What is a difference between private and public access modifier in C#?

C# Mid-level
When and why would you use an interface in C#?

C# Junior
How many classes can a class be inherited from in C#?

C# Junior
What is a difference between an abstract class and an interface in C#?

C# Junior
What is a JIT inlining in C#?

C# Junior
What is a difference between a property and a field in C#?

C# Junior
What types of loops exist in C#?

C# Junior
What is inheritance in C#?

C# Junior
What is 'public' keyword good for in C#?

C# Junior
What is happening and in what order when a new object in being created C#?

C# Junior
What is 'return' keyword used for in C#?

C# Junior
What is 'this' keyword used for in C#?

C# Junior
In C# how do you call one method from another method where both method are inside of the same class?

C# Junior
What is an attribute in C#?

C# Junior
What must every method have in C#?

C# Junior
What do you know about methods in C#?

C# Junior
What is execution context in C#?

C# Junior
What is a local variable and where can it be declared in C#?

C# Junior
What is a global variable and where can it be declared in C#?

C# Junior
What does the method signature consist of in C#?

C# Junior
What does the method consist of in C#?

C# Junior
What are method parameters in C#?

C# Junior
In C#, why can you declare a variable using code 'int x;' but you can't declare a variable using code 'var x;'?

C# Junior
What is a breakpoint in C# good for?

C# Junior
How many classes should be in one .cs file and why?

C# Junior
What is the 'class' keyword used for in C#?

C# Junior
What is C#?

C# Junior
What is a method parameter in C#?

C# Junior
What is a method return type in C#?

C# Junior
When do you use semicolon in C# and why?

C# Junior
What is an instance method in C#?

C# Junior
What is a static method in C#?

C# Junior
How can you find out what is the variable type?

C# Junior
How can you declare a variable?

C# Junior
How can you assign a value to a variable in C#?

C# Junior
What is a 'var' keyword in C# good for?

C# Junior
What is a variable?

C# Junior
What is the 'new' keyword used for in C#?

C# Junior
How can you assign a value to a property in C#?

C# Junior
How can you recognize a property in C#?

C# Junior
What is a property in C#?

C# Junior
What is a class instance in C#?

C# Junior
What is a difference between value type and reference type?

C# Junior
What is an object reference in C#?

C# Junior
What C# data types do you know?

C# Junior
What is a data type?

C# Junior
How do you recognize a method call in C#?

C# Junior
What is a method in C# and how do you define one?

C# Junior
What is a constructor in C# and why would you use it?

C# Junior
What parts does a C# class usually contain?

C# Junior
What is a project in Visual Studio and what file extension does it have?

C# Junior
What is a solution in Visual Studio and what file extension does it have?

C# Junior
What is a difference between .cs file and class?

C# Junior
Where does the .NET C# program start its flow when you build and run a console application?

C# Junior
What is an object in C#?

C# Junior
What is a class in C#?

C# Junior
What are the advantages of using 'using' keyword in C# and why would you use it?

C# Junior
What is a namespace in C# and what is it good for?

C# Junior
What is abstract class and what is it good for?

C# Mid-level
What is covariance and contravariance?

.NET ASP.NET MVC ASP.NET WebAPI ASP.NET WebForms C# Senior
Have you ever consumed some 3rd party API? What was it? Have you ever designed your own API? Could you describe it a bit?

.NET Architecture ASP.NET WebAPI C# Web services Mid-level
What is serialization/deserialization? What types of serialization do you know?

.NET C# Mid-level
What is a MultiCastDelegate? What is it good for? Give some real use case

.NET C# Senior
Can you use multiple catch blocks in try/catch? What would be a use case for such thing?

C# Junior
What do you know about delegates?

.NET C# Mid-level
What is MSIL?

.NET ASP.NET MVC ASP.NET WebAPI ASP.NET WebForms C# Senior
What is JIT?

.NET ASP.NET MVC ASP.NET WebAPI ASP.NET WebForms C# Senior
Could you describe how is memory management done in .NET?

.NET ASP.NET MVC ASP.NET WebAPI ASP.NET WebForms C# Senior
Write a code that takes an integer number and outputs its digits to the console.

.NET C# Code challenge Mid-level
What is variable capturing good for and how does it work?

.NET C# Senior
What will be the output of the following code that is using delegates?

.NET C# Code challenge Senior
Could you describe what generic type inference is and what will be the output of this program?

.NET C# Code challenge Senior
What is the difference between IEnumerable and IQueryable?

.NET C# Entity Framework LINQ Performance Senior
What is boxing and unboxing?

.NET C# Performance Junior
Do you use generics? What are they good for? And what are constraints and why to use them?

.NET C# Performance Mid-level
Could you explain what the following LINQ methods OrderBy, Where and Single do and what will be the output of the code?

.NET C# LINQ Junior
Could you explain on the following example what a deferred execution is and what materialization is? What will the output be?

.NET C# LINQ Performance Mid-level
What array initialization syntaxes do you know?

.NET C# Mid-level
How does the .Max(...) work in LINQ? What will be the result of the following code?

.NET C# LINQ Junior
What is a difference between partial class and partial method and what are they good for?

.NET C# Senior
What is a data type of the following variable? var number = 1.0;

.NET C# Senior

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