Difference between system.string and system.Text.stringbuilder classes in c#.net?

Question

By-default all the methods & variables in class are private.

In C#.net Main() method is private then how compiler access this Main() Method out side the class because compiler is not part of our program then how compiler access this Main() method?

Here we loose our data abstraction property ? Can anyone put some light on it?

Answer 1

Strings are immutable in C#.

For suppose you have declared a string as follows
string name = "Naveen" in case if you want to append any text to string name a new copy of string is created whereas if you use stringbuilder no new copy gets created if you want to append any string even after intialization of it.We can use concat method of it and append.