C# Common Interview Questions

Q: What do you understand by C#?
A: C# is a one of Dot Net programming language and supports functional, generic, object-oriented, and component-oriented programming disciplines. C# was interested by Microsoft on June 2000 and is updating new features with different versions regularly.
The latest version is C# 5.0.

Q: What are the different types of C# used to create a csharp program?
A: Basically C# compiler supplies intrinsic data types (int, double, string etc) and programmers can define user defined data types (class, struct, enum etc). C# are one of the following types,

• Value types
• Reference types

Q: Demonstrate the different C# types. 
A: C# are one of the following types,

• Value Type: Variables of value types directly contain their data and value types store in stack.
• Reference Type: Variables of reference types store references to their data. Reference types store in Heap Memory.

Q: What are the three important Object Oriented programming features supported by C #?

• Encapsulation
• Inheritance
• Polymorphism

Q: Can we apply inheritance to structure type in C#?
A: No, inheritance cannot be applied to structure as structure types are always sealed.

Q: What are the main features involved in C#2.0 Version?
A: C# Generics and Iterators are some of the features introduced in C# 2.0 version which helped in the process of C# collections. Some of the common features are,

• Partial Classes
• Anonymous Methods
• Nullable Types
• Co-varience and Contra Varience in Delegates

Q: Explain the features included in C#4.0 version.
A: C# 4.0 mainly focused on dynamic programming and contains following features.

• Dynamic Binding
• Name and optional Arguments
• Improvements in CoVarience and ContraVarience
• COM specific interop features