C# job interview questions

QUESTION 1:

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

C# Mid-level

QUESTION 2:

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

C# Mid-level

QUESTION 3:

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

C# Junior

QUESTION 4:

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

C# Junior

QUESTION 5:

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

C# Junior

QUESTION 6:

What is a JIT inlining in C#?

C# Junior

QUESTION 7:

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

C# Junior

QUESTION 8:

What types of loops exist in C#?

C# Junior

QUESTION 9:

What is inheritance in C#?

C# Junior

QUESTION 10:

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

C# Junior

QUESTION 11:

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

C# Junior

QUESTION 12:

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

C# Junior

QUESTION 13:

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

C# Junior

QUESTION 14:

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

C# Junior

QUESTION 15:

What is an attribute in C#?

C# Junior

QUESTION 16:

What must every method have in C#?

C# Junior

QUESTION 17:

What do you know about methods in C#?

C# Junior

QUESTION 18:

What is execution context in C#?

C# Junior

QUESTION 19:

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

C# Junior

QUESTION 20:

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

C# Junior

QUESTION 21:

What does the method signature consist of in C#?

C# Junior

QUESTION 22:

What does the method consist of in C#?

C# Junior

QUESTION 23:

What are method parameters in C#?

C# Junior

QUESTION 24:

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

QUESTION 25:

What is a breakpoint in C# good for?

C# Junior

QUESTION 26:

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

C# Junior

QUESTION 27:

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

C# Junior

QUESTION 28:

What is C#?

C# Junior

QUESTION 29:

What is a method parameter in C#?

C# Junior

QUESTION 30:

What is a method return type in C#?

C# Junior

QUESTION 31:

When do you use semicolon in C# and why?

C# Junior

QUESTION 32:

What is an instance method in C#?

C# Junior

QUESTION 33:

What is a static method in C#?

C# Junior

QUESTION 34:

How can you find out what is the variable type?

C# Junior

QUESTION 35:

How can you declare a variable?

C# Junior

QUESTION 36:

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

C# Junior

QUESTION 37:

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

C# Junior

QUESTION 38:

What is a variable?

C# Junior

QUESTION 39:

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

C# Junior

QUESTION 40:

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

C# Junior

QUESTION 41:

How can you recognize a property in C#?

C# Junior

QUESTION 42:

What is a property in C#?

C# Junior

QUESTION 43:

What is a class instance in C#?

C# Junior

QUESTION 44:

What is a difference between value type and reference type?

C# Junior

QUESTION 45:

What is an object reference in C#?

C# Junior

QUESTION 46:

What C# data types do you know?

C# Junior

QUESTION 47:

What is a data type?

C# Junior

QUESTION 48:

How do you recognize a method call in C#?

C# Junior

QUESTION 49:

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

C# Junior

QUESTION 50:

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

C# Junior

QUESTION 51:

What parts does a C# class usually contain?

C# Junior

QUESTION 52:

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

C# Junior

QUESTION 53:

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

C# Junior

QUESTION 54:

What is a difference between .cs file and class?

C# Junior

QUESTION 55:

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

C# Junior

QUESTION 56:

What is an object in C#?

C# Junior

QUESTION 57:

What is a class in C#?

C# Junior

QUESTION 58:

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

C# Junior

QUESTION 59:

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

C# Junior

QUESTION 60:

What is abstract class and what is it good for?

C# Mid-level

QUESTION 61:

What is covariance and contravariance?

.NETASP.NET MVCASP.NET WebAPIASP.NET WebFormsC# Senior

QUESTION 62:

Have you ever consumed some 3rd party API? What was it? Have you ever designed your own API? Could you describe it a bit?

.NETArchitectureASP.NET WebAPIC#Web services Mid-level

QUESTION 63:

What is serialization/deserialization? What types of serialization do you know?

.NETC# Mid-level

QUESTION 64:

What is a MultiCastDelegate? What is it good for? Give some real use case

.NETC# Senior

QUESTION 65:

Can you use multiple catch blocks in try/catch? What would be a use case for such thing?

C# Junior

QUESTION 66:

What do you know about delegates?

.NETC# Mid-level

QUESTION 67:

What is MSIL?

.NETASP.NET MVCASP.NET WebAPIASP.NET WebFormsC# Senior

QUESTION 68:

What is JIT?

.NETASP.NET MVCASP.NET WebAPIASP.NET WebFormsC# Senior

QUESTION 69:

Write a code that takes an integer number and outputs its digits to the console.

.NETC#Code challenge Mid-level

QUESTION 70:

What is variable capturing good for and how does it work?

.NETC# Senior

QUESTION 71:

What will be the output of the following code that is using delegates?

.NETC#Code challenge Senior

QUESTION 72:

Could you describe what generic type inference is and what will be the output of this program?

.NETC#Code challenge Senior

QUESTION 73:

What is the difference between IEnumerable and IQueryable?

.NETC#Entity FrameworkLINQPerformance Senior

QUESTION 74:

What is boxing and unboxing?

.NETC#Performance Junior

QUESTION 75:

Do you use generics? What are they good for? And what are constraints and why to use them?

.NETC#Performance Mid-level

QUESTION 76:

Could you explain what the following LINQ methods OrderBy, Where and Single do and what will be the output of the code?

.NETC#LINQ Junior

QUESTION 77:

Could you explain on the following example what a deferred execution is and what materialization is? What will the output be?

.NETC#LINQPerformance Mid-level

QUESTION 78:

What array initialization syntaxes do you know?

.NETC# Mid-level

QUESTION 79:

How does the .Max(...) work in LINQ? What will be the result of the following code?

.NETC#LINQ Junior

QUESTION 80:

What is a difference between partial class and partial method and what are they good for?

.NETC# Senior

QUESTION 81:

What is a data type of the following variable? var number = 1.0;

.NETC# Senior

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