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.
Answer 2 : No.
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.
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.
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.
Answer 6 : System.Object.
Answer 7 : No.
Answer 8 : It is available to any sub-class (a class inheriting this class).
Answer 9 : Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.
Answer 10 : It is available to classes that are within the same assembly and derived from the specified base class.
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