Unique key for tree nodes

I use an infragistics tree control and each node requires a unique key.  If a key is not provided it uses the node text which rapidly causes and exception.  What is the best way to create a key the will always be unique?
Moe DeShongAsked:
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Why not just sequence them in the order that they are added to the tree? That is, you could just declare:
Dim currentNodeID as Integer
NodeID +=1
Of course, that strategy may not work if you need to reference a node by ID without knowing the chronology of the adds. If that is likely, you may need to designate your own numbering scheme (much like a document outline.... roman numerals, with decimal children, which have alphabetic sub-children, and so forth).

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Oops.. that would be
currentNodeID +=1
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