>What is the need for randomness? Not clear from the post. Why not ask the server for a unique ID if GUID is considered too flakey?

Don't think GUIDs are flaky (at least compared to other options). If you ask a server to generate an ID (what are you suggesting? An int?) you have problems with overlapping hits......

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>>Hi,
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>>I want to store an ID of a tablet (e.g. iPad, Android, etc.) into a local storage of the browser. Then at run-time, my app will get this ID string and use it to get/set certain data on the web server that will "belong" to this or that device. I found some threads on Stackoverflow with sophisticated methods of generating a random string. Since I am dealing with 10 (or 20 at most) devices, I believe, this level of complexity is too much. Can you suggest a simple method of creating/getting a string of about 10 alphanumeric characters, from .net application? For example, "ABC123", "CBGHHD", and so on.
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>>TIA