string, const, ref and Intern
For Delphi developers who switched to C# and are used to resort to the const keyword when they pass string parameters and wonder how to do something similar: there is no need for this.
Yes, the const and ref keywords exist, but they are used for something else. The const keyword can be used in Delphi for string parameters to gain performance by avoiding that a new copy of the string be created.
In .NET, string references are kept in a pool whenever possible. Creations of new string instances are avoided as much as possible. When you pass a string as a parameter, its value is the same inside the method as outside the method, so only one reference is used.
You can get more information by paying a visit to the String.Intern method documentation.
