C#: String interning

Code Snippet: String Interning
Recall that the equivalence operator (==) will test for value equivalence for value types and for address or reference equivalence for reference types.
string a = "Hello";     // ldstr
string b = "Hello";     // ldstr (Interning)
string c = String.Copy(a);
Console.WriteLine(a == c);
Console.WriteLine((object)a == (object)c);
Console.WriteLine(a == b);                             // Call the op_Equality method
Console.WriteLine((object)a == (object)b);   
// opcode ceq (compare equal)
=== Program Output ===
The system is internaling strings—CLI guarantees that the result of two ldstr instructions refering to two metadata tokens with the same sequence of characters return precisely the same string object.

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