C# Programming Interview Questions | C# Advanced Interview Questions and Answers

C# Interview Question and Answers

What is C#?

C# is a programming language designed by Microsoft. It is loosely based on C/C++, and bears a striking similarity to Java in many ways. Microsoft describes C# as follows.
C# is a simple, modern, object oriented and type safe programming language derived from C and C++. C#(pronounced C sharp) is firmly planted in the C and C++ family tree of languages, and will immediately be familiar to C and C++ programmers.
C# aims to combine the high productivity of Visual Basic and the raw power of C++.

How many languages .NET is supporting now?

When .NET was introduced it came with some 16 languages. VB.NET, C#, COBOL and PERL etc.

What are the escape sequence supported by c#?

C# defines the following character escape sequences:

\' – single quote, needed for character literals
\" – double quote, needed for string literals
\\ - backslash
\0 - Unicode character 0
\a – Alert (character 7)
\b – Backspace (character 8)
\f – Form feed (character 12)
\n – New line (character 10)
\r – Carriage return (character 13)
\t – Horizontal tab (character 9)
\v – Vertical quote (character 11)
\uxxxx – Unicode escape sequence for character with hex value xxxx
\xn[n][n][n] – Unicode escape sequence for character with hex value nnnn ( variable length version of \ uxxxx)
\Uxxxxxxxx – Unicode escape sequence for character with hex value xxxxxxxx (for generating surrogates) Of these, \a, \f, \v, \x and \U are rarely used in my experience.

Is C# an object oriented language?

Yes. C# provides language support for the so called "Three Pillars of Object Oriented Programming" : encapsulation, polymorphism and inheritance.

What are sealed classes in C#?

The sealed modifier is used to prevent derivation from a class.
A compile time error occurs if a sealed class is specified as the base class of another class. (A sealed class cannot also be an abstract class).

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