1.
What is an Object?
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Xamarin C# interview questions.
Only challenges
- 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?
Answer:
- 29.
What is Managed or Unmanaged Code?
Answer:
- 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?
Answer:
- 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#?
Answer:
- 39.
Explain Anonymous type in C#
Answer:
- 40.
What is the difference between dynamic type variables and object type variables?
Answer:
- 41.
What is the difference between Equality Operator (==) and Equals() Method in C#?
Answer:
- 42.
What are the uses of “using” in C#
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- 43.
How encapsulation is implemented in C#?
Answer:
- 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.
Answer:
- 48.
What is an anonymous function in C#?
Answer:
- 49.
What is difference between constants and readonly?
Answer:
- 50.
What is Reflection in C#.Net?
Answer:
- 51.
What is a Destructor in C#?
Answer:
- 52.
What is the difference between constant and readonly in C#?
Answer:
- 53.
What is scope of a Internal member variable of a C# class?
Answer:
- 54.
What is delegates in C# and uses of delegates?
Answer:
- 55.
What is extension method in C# and how to use them?
Answer:
- 56.
What is sealed class in C#?
Answer:
- 57.
Can you allow a class to be inherited, but prevent a method from being overridden in C#?
Answer:
- 58.
Refactor the code
Answer:
- 59.
Given an array of ints, write a C# method to total all the values that are even numbers.
Answer:
- 60.
What interface should your data structure implement to make the "Where" method work?
Answer:
- 61.
What is an Object Pool in .Net?
Answer:
- 62.
What is difference between late binding and early binding in C#?
Answer:
- 63.
Is operator overloading supported in C#?
Answer:
- 64.
Why to use lock statement in C#?
Answer:
- 65.
What is the Constructor Chaining in C#?
Answer:
- 66.
What is the difference between dispose and finalize methods in c#?
Answer:
- 67.
Name difference between "is" and "as" operator in C#
Answer:
- 68.
What is marshalling and why do we need it?
Answer:
- 69.
Can you create a function in C# which can accept varying number of arguments?
Answer:
- 70.
Describe the accessibility modifier "protected internal".
Answer:
- 71.
What are the different ways a method can be overloaded?
Answer:
- 72.
When to use ArrayList over array[] in c#?
Answer:
- 73.
What are the uses of delegates in C#?
Answer:
- 74.
What is the best practice to have best performance using Lazy objects?
Answer:
- 75.
What is scope of a Protected Internal member variable of a C# class?
Answer:
- 76.
What is Indexer in C#?
Answer:
- 77.
Explain what is short-circuit evaluation in C#
Answer:
- 78.
What are the differences between a multidimensional array and an array of arrays in C#?
Answer:
- 79.
What are pointer types in C#?
Answer:
- 80.
What is the "yield" keyword used for in C#?
Answer:
- 81.
IEnumerable vs List - What to Use? How do they work?
Answer:
- 82.
What's the difference between StackOverflowError and OutOfMemoryError?
Answer:
- 83.
Can we have only “try” block without “catch” block in C#?
Answer:
- 84.
What is the difference between System.ApplicationException class and System.SystemException class?
Answer:
- 85.
Explain the difference between Select and Where
Answer:
- 86.
What is the difference between Func
Answer:
- 87.
In try block if we add return statement whether finally block is executed in C#?
Answer:
- 88.
Can Multiple Inheritance implemented in C# ?
Answer:
- 89.
What is the output of the program below?
Answer:
- 90.
What is the use of conditional preprocessor directive in C#?
Answer:
- 91.
What's the difference between the System.Array.CopyTo() and System.Array.Clone()?
Answer:
- 92.
What is jagged array in C#.Net and when to prefer jagged arrays over multi-dimensional arrays?
Answer:
- 93.
What is the “volatile” keyword used for?
Answer:
- 94.
What is the method MemberwiseClone() doing?
Answer:
- 95.
Can you add extension methods to an existing static class?
Answer:
- 96.
Explain the difference between IQueryable, ICollection, IList & IDictionary interfaces?
Answer:
- 97.
What is the use of static constructors?
Answer:
- 98.
Implement the "Where" method in C#
Answer:
- 99.
What is the difference between lambdas and delegates?
Answer:
- 100.
What is a preprocessor directives in C#?
Answer:
- 101.
Could you explain the difference between Func vs. Action vs. Predicate?
Answer:
- 102.
What is multicast delegate in C#?
Answer:
- 103.
Can you create sealed abstract class in C#?
Answer:
- 104.
What are the differences between IEnumerable and IQueryable?
Answer:
- 105.
in C#, when should we use abstract classes instead of interfaces with extension methods?
Answer:
- 106.
Could you explain the difference between destructor, dispose and finalize method?
Answer:
- 107.
What are circular references?
Answer:
- 108.
What is deep or shallow copy concept in C#?
Answer:
- 109.
Explain what is weak reference in C#?
Answer:
- 110.
What are the benefits of a Deferred Execution in LINQ?
Answer:
- 111.
List some different ways for equality check in .Net
Answer:
- 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?
Answer:
- 113.
Why Doesn't C# Allow Static Methods to Implement an Interface?
Answer:
- 114.
What is the output of the short program below? Explain your answer.
Answer:
- 115.
What is the output of the program below? Explain your answer.
Answer:
- 116.
Is the comparison of time and null in the if statement below valid or not? Why or why not?
Answer:
- 117.
Calculate the circumference of the circle
Answer:
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