How does the String class differ from other data types in C#?

In C#, the String class differs from most other data types in that it is a reference type, but it behaves as an immutable object.

Main differences:

• Immutability: Once a string is created, its contents cannot be changed. Any operations that seem to modify the string (for example, concatenation) actually create a new String object.

• Reference type: String is a class, not a struct, so variables of type string hold a reference to an object in memory.

• Optimizations: Thanks to immutability, strings can be used in a string pool (interning), which saves memory.

• Garbage collection: Since strings are objects, they are managed by the garbage collector, simplifying memory management.

Example:

string a = "hello";
string b = a;
a = a + " world"; // Creates a new string object

// b remains "hello", a becomes "hello world"

Thus, despite being a reference type, strings behave like value types in terms of immutability, ensuring safety and predictability when working with text.