C# When to use string classes in C#?

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Immutable string classes in C# are essential for efficiency, particularly because they can share storage for identical objects, reducing overhead associated with creating and destroying temporary objects. In object-oriented programming, seemingly harmless operations can lead to unnecessary object creation, but immutable strings mitigate this issue. Mutable strings, such as those managed by the StringBuilder class, should only be used when the string's contents are expected to change after creation. StringBuilder pre-allocates a large array for characters, minimizing the need for repeated memory allocation during extensive string concatenation, making it significantly more efficient in scenarios involving heavy string manipulation.
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We have a string builder class which is mutable in C#. Why do we need immutable string classes?
 
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Basically, for efficiency. for example the immutable classes can share storage for identical objects. Harmless-looking statements in an object oriented language can often create and destroy temporary objects, and the overheads are much smaller if the contents of these are known to be immutable.

You should only use mutable strings if you know the contents of the string may change after you have created it.
 
A StringBuilder class just pre-allocates a big array to hold the characters of a string you are yet to create. It prevents the need to call the allocator over and over again if concatenating a bunch of (immutable) shorter strings.

When there is a LOT of string concatenation going on at runtime, it is often more efficient (significantly more) to use StringBuilder.
 

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