Top 300 C# & OOPS Interview Questions and Answers Part-01

This is part-01 of Top 300 C# & OOPS Interview Questions and Answers. In this e-book you will get 100 C# & OOPS Interview Questions and Answers with practical implementation. Very soon 2nd and 3rd part will be available.

Following Questions you will get in this e-book:

Q1) What is C# ?

Q2) What is .NET and .NET Framework ?

Q3) What is Common Language Runtime(CLR) ?

Q4) What are the functions , components and benefits of CLR ?

Q5) What is common type system (CTS) in .Net framework?

Q6) What is managed and Unmanaged code in c# ?

Q7) What is the differences between const and readonly in c# ?

Q8) What is the differences between ref and out in c# ?

Q9) How to convert int to Enum in c# ?

Q10) What is constructor chaining in c# ?

Q11) Explain HashTable in c# ?

Q12) Explain Dictionary in c# ?

Q14) What is the differences between HashTable and Dictionary in c# ?

Q14) What is GAC and where it is located ?

Q15) What is the differences between Object pooling and Connection pooling ?

Q16) What is the differences between Convert.ToString() and ToString() in c#?

Q17) What are the advantages of using Array in c# ?

Q18) What are the disadvantages of using Array in c# ?

Q19) What is var keyword in c# ?

Q20) When to use var keyword in c# ?

Q21) What is Dynamic keyword in c# ?

Q22) What is the differences between var and dynamic in c#?

Q23) What is interface in c# ?

Q24) What are the benefits of using interface in c# ?

Q25) What is Singleton design pattern in c# ?

Q26) What is Singleton design pattern in c# ? (Practical Implementation)

Q27) What are the benefits of using Singleton design pattern in c# ?

Q28) What are the disadvantages of using Singleton design pattern in c# ?

Q29) What is Enum in c# ?

Q30) What is the differences between struct and Enum in c#?

Q31) What is the differences between String and string in c#?

Q32) How to check whether Dictionary contain any value or not ?

Q33) How to check whether Dictionary contain any key or not ?

Q34) What is async and await in c# ?

Q35) What is AutoMapper in c# ?

Q37) What are the 4 pillars of OOPS ?

Q38) What is abstraction in c# ?

Q39) What is encapsulation in c# ?

Q40) What is the differences between abstraction and encapsulation in c#?

Q41) What is Gang Of Four (GOF) ?

Q42) What is Shallow Copy in c# ?

Q43) What is Deep Copy in c# ?

Q44) Can var hold null value in c# ?

Q45) How to sort dictionary by value in c# ?

Q46) Differences between float, double and decimal in c# ?

Q47) How to calculate someone's age in c# ?

Q48) Differences between int and int.32 in c#?

Q49) Differences between int16, int32 and int64 in c# ?

Q50) What is type safe in c# ?

Q51) Differences between OOPS and Procedural programming in c# ?

Q52) What are the advantages of OOPS ?

Q53) What are the limitations of OOPS ?

Q54) How to prevent class from being inherited in c# ?

Q55) Explain polymorphism and its type ?

Q56) Can we allow a class being inherited but prevent method from being overridden ?

Q57) Why static constructor is parameter less ?

Q58) What is static keyword in c# ?

Q59) Can a static class contain non static members ?

Q60) Can a static class implement the interface ?

Q61) Can we mark static class as sealed ?

Q62) Can we have destructor in static class ?

Q63) Can we pass ref or out parameter to static method ?

Q64) Can a non-static class contain a static constructor ?

Q65) Can a non-static class contain a instance constructor ?

Q66) Can a method return multiple value at a time in c# ?

Q67) What is operator overloading in c# ?

Q68) Is it possible to restrict object creation in c# ?

Q69) What is constructor in c# ?

Q70) What are the different types of constructor in c# ?

Q71) What is default constructor in c# ?

Q72) What is parameterized constructor in c# ?

Q73) What is copy constructor in c# ?

Q74) What is static constructor in c# ?

Q75) What is private constructor in c# ? 

Q76) What is constructor overloading in c# ?

Q77) How many constructor can be defined in a class ?

Q78) Can a static class inherited from other class ?

Q79) Can a static class contains any private constructor ?

Q80) Where static class and its members stored in memory ?

Q81) Static method overloading is allowed or not ?

Q82) Can a static constructor be private ?

Q83) Can we define a struct as static ?

Q84) Main() method can be non-static in c# ?

Q85) Can a static method declare local static variable ?

Q86) Differences between is and as operator in c# ?

Q87) Differences between struct and class in c# ?

Q88) What are the nullable type in c#

Q89) Can multiple catch block be executed in c# ?

Q90) Can we have a try block without a catch block in c# ?

Q91) Differences between value type and reference type in c# ?

Q92) What is garbage collection in c# ?

Q93) What is boxing and unboxing in c# ?

Q94) What is the use of Params keyword in c# ?

Q95) Differences between break and continue in c# ?

Q96) What are the literals in c# ?

Q97) What are the different data types in c# ?

Q98) What are the different variables in c# ?

Q99) What are the keywords in c# ?

Q100) What is namespace in c# ?



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