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C# interview questions

C# interview questions.

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  • 1.

    What is an Object?

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  • 2.

    What is the difference between "continue" and "break" statements in C#?

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  • 3.

    What is C#?

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  • 4.

    What are property Accessors?

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  • 5.

    What are nullable types in C#?

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  • 6.

    Why can't you specify the accessibility modifier for methods inside the interface?

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  • 7.

    What are reference types in C#?

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  • 8.

    What are generics in C#?

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  • 9.

    What is an Abstract Class?

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  • 10.

    What are Custom Exceptions?

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  • 11.

    What is namespace in C#?

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  • 12.

    What is Serialization?

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  • 13.

    What are dynamic type variables in C#?

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  • 14.

    Can "this" be used within a static method?

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  • 15.

    In how many ways you can pass parameters to a method?

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  • 16.

    What is the difference between a struct and a class in C#?

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  • 17.

    What are the different types of classes in C#?

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  • 18.

    Can you return multiple values from a function in C#?

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  • 19.

    Define Property in C#?

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  • 20.

    What is Boxing and Unboxing?

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  • 21.

    What is the difference between string and StringBuilder in c#?

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  • 22.

    How is Exception Handling implemented in C#?

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  • 23.

    What is LINQ in C#?

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  • 24.

    Can multiple catch blocks be executed?

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  • 25.

    What is enum in C#?

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  • 26.

    What are partial classes?

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  • 27.

    Why to use “finally” block in C#?

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  • 28.

    What you understand by Value types and Reference types in C#.Net?

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  • 29.

    What is Managed or Unmanaged Code?

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  • 30.

    Filter out the first 3 even numbers from the list using LINQ

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  • 31.

    What is the difference between ref and out keywords?

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  • 32.

    What is difference between Throw Exception and Throw Clause?

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  • 33.

    A structure in C# can implement one or more interfaces. Is it true or false?

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  • 34.

    What is the difference between Virtual method and Abstract method?

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  • 35.

    What is the use of Null Coalescing Operator (??) in C#?

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  • 36.

    What is Virtual Method in C#?

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  • 37.

    What is the difference between Interface and Abstract Class?

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  • 38.

    What is lambda expressions in C#?

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  • 39.

    Explain Anonymous type in C#

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  • 40.

    What is the difference between dynamic type variables and object type variables?

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  • 41.

    What is the difference between Equality Operator (==) and Equals() Method in C#?

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  • 42.

    What are the uses of “using” in C#

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  • 43.

    How encapsulation is implemented in C#?

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  • 44.

    What is the difference between overloading and overriding?

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  • 45.

    How can you prevent a class from overriding in C#?

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  • 46.

    Explain Code compilation in C#

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  • 47.

    What is the output of the program below? Explain your answer.

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  • 48.

    What is an anonymous function in C#?

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  • 49.

    What is difference between constants and readonly?

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  • 50.

    What is Reflection in C#.Net?

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  • 51.

    What is a Destructor in C#?

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  • 52.

    What is the difference between constant and readonly in C#?

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  • 53.

    What is scope of a Internal member variable of a C# class?

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  • 54.

    What is delegates in C# and uses of delegates?

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  • 55.

    What is extension method in C# and how to use them?

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  • 56.

    What is sealed class in C#?

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  • 57.

    Can you allow a class to be inherited, but prevent a method from being overridden in C#?

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  • 58.

    Refactor the code

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  • 59.

    Given an array of ints, write a C# method to total all the values that are even numbers.

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  • 60.

    What interface should your data structure implement to make the "Where" method work?

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  • 61.

    What is an Object Pool in .Net?

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  • 62.

    What is difference between late binding and early binding in C#?

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  • 63.

    Is operator overloading supported in C#?

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  • 64.

    Why to use lock statement in C#?

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  • 65.

    What is the Constructor Chaining in C#?

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  • 66.

    What is the difference between dispose and finalize methods in c#?

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  • 67.

    Name difference between "is" and "as" operator in C#

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  • 68.

    What is marshalling and why do we need it?

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  • 69.

    Can you create a function in C# which can accept varying number of arguments?

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  • 70.

    Describe the accessibility modifier "protected internal".

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  • 71.

    What are the different ways a method can be overloaded?

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  • 72.

    When to use ArrayList over array[] in c#?

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  • 73.

    What are the uses of delegates in C#?

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  • 74.

    What is the best practice to have best performance using Lazy objects?

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  • 75.

    What is scope of a Protected Internal member variable of a C# class?

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  • 76.

    What is Indexer in C#?

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  • 77.

    Explain what is short-circuit evaluation in C#

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  • 78.

    What are the differences between a multidimensional array and an array of arrays in C#?

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  • 79.

    What are pointer types in C#?

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  • 80.

    What is the "yield" keyword used for in C#?

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  • 81.

    IEnumerable vs List - What to Use? How do they work?

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  • 82.

    What's the difference between StackOverflowError and OutOfMemoryError?

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  • 83.

    Can we have only “try” block without “catch” block in C#?

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  • 84.

    What is the difference between System.ApplicationException class and System.SystemException class?

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  • 85.

    Explain the difference between Select and Where

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  • 86.

    What is the difference between Func and delegate?

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  • 87.

    In try block if we add return statement whether finally block is executed in C#?

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  • 88.

    Can Multiple Inheritance implemented in C# ?

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  • 89.

    What is the output of the program below?

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  • 90.

    What is the use of conditional preprocessor directive in C#?

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  • 91.

    What's the difference between the System.Array.CopyTo() and System.Array.Clone()?

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  • 92.

    What is jagged array in C#.Net and when to prefer jagged arrays over multi-dimensional arrays?

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  • 93.

    What is the “volatile” keyword used for?

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  • 94.

    What is the method MemberwiseClone() doing?

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  • 95.

    Can you add extension methods to an existing static class?

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  • 96.

    Explain the difference between IQueryable, ICollection, IList & IDictionary interfaces?

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  • 97.

    What is the use of static constructors?

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  • 98.

    Implement the "Where" method in C#

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  • 99.

    What is the difference between lambdas and delegates?

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  • 100.

    What is a preprocessor directives in C#?

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  • 101.

    Could you explain the difference between Func vs. Action vs. Predicate?

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  • 102.

    What is multicast delegate in C#?

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  • 103.

    Can you create sealed abstract class in C#?

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  • 104.

    What are the differences between IEnumerable and IQueryable?

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  • 105.

    in C#, when should we use abstract classes instead of interfaces with extension methods?

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  • 106.

    Could you explain the difference between destructor, dispose and finalize method?

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  • 107.

    What are circular references?

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  • 108.

    What is deep or shallow copy concept in C#?

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  • 109.

    Explain what is weak reference in C#?

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  • 110.

    What are the benefits of a Deferred Execution in LINQ?

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  • 111.

    List some different ways for equality check in .Net

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  • 112.

    You have defined a destructor in a class that you have developed by using the C# programming language, but the destructor never executed. Why did the destructor not execute?

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  • 113.

    Why Doesn't C# Allow Static Methods to Implement an Interface?

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  • 114.

    What is the output of the short program below? Explain your answer.

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  • 115.

    What is the output of the program below? Explain your answer.

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  • 116.

    Is the comparison of time and null in the if statement below valid or not? Why or why not?

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  • 117.

    Calculate the circumference of the circle

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