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CSharp Interview Questions Answers

Question 1 : What is CLS (Common Language Specificaiton)?

Answer 1 : It provides the set of specificaiton which has to be adhered by any new language writer / Compiler writer for .NET Framework. This ensures Interoperability. For example: Within a ASP.NET application written in C#.NET language, we can refer to any DLL written in any other language supported by .NET Framework. As of now .NET Supports around 32 languages.

Question 2 :   Can you store multiple data types in System.Array?

Answer 2 : No.

Question 3 :   What’s the difference between System.String and System.Text.StringBuilder classes?

Answer 3 : System.String is immutable.  System.StringBuilder was designed with the purpose of having a mutable string where a variety of operations can be performed. 

Question 4 : What’s the advantage of using System.Text.StringBuilder over System.String?

Answer 4 :   StringBuilder is more efficient in cases where there is a large amount of string manipulation.  Strings are immutable, so each time a string is changed, a new instance in memory is created.

Question 5 :   What does the term immutable mean?

Answer 5 : The data value may not be changed.  Note: The variable value may be changed, but the original immutable data value was discarded and a new data value was created in memory.

Question 6 : What’s the top .NET class that everything is derived from?

Answer 6 : System.Object. 

Question 7 : Does C# support multiple-inheritance?

Answer 7 : No.

Question 8 :   Who is a protected class-level variable available to?

Answer 8 :   It is available to any sub-class (a class inheriting this class).

Question 9 : Are private class-level variables inherited?

Answer 9 :   Yes, but they are not accessible.  Although they are not visible or accessible via the class interface, they are inherited. 

Question 10 : Describe the accessibility modifier “protected internal”.

Answer 10 :    It is available to classes that are within the same assembly and derived from the specified base class. 

CSharp Contributors

Rajeev Katiyar

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