Answer Posted / panchdev

stringbuilder:-
1-This class represents a string-like object whose value is a mutable sequence of characters.
2- The value is said to be mutable because it can be modified once it has been created by appending, removing, replacing, or inserting characters. For comparison, see the String class.
3-The default capacity for this implementation is 16, and the default maximum capacity is Int32.
string:-
1-A String object is called immutable (read-only) because its value cannot be modified once it has been created. Methods that appear to modify a String object actually return a new String object that contains the modification. If it is necessary to modify the actual contents of a string-like object, use the System.Text.StringBuilder class.

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