Generate a unique key value in code automatically

In database tables there is the possibility to automatically generate a unique primary key for a record.

What I would like is this sort of functionality BUT nothing to do with a database.  The data will be structured (tree like) and handled in the app.  I had the thought that maybe there is a built in class in C# that I can use to generate a unique value as an identifier.
I can code one myself so I am asking only about a built in, ready to use class if there is one.
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AndyAinscowFreelance programmer / ConsultantAsked:
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Vel EousResearch & Development ManagerCommented:
The Guid structure may be what you are looking for.
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Éric MoreauSenior .Net ConsultantCommented:
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AndyAinscowFreelance programmer / ConsultantAuthor Commented:
Nice idea.  Simple to implement and, these days, memory isn't a real constraint anymore in most cases.
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