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Asked: 2026-05-26T00:33:27+00:00

I’m doing some client-side stuff with Javascript/JQuery with .Net controls which expose their GUID/UniqueIdentifier

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I’m doing some client-side stuff with Javascript/JQuery with .Net controls which expose their GUID/UniqueIdentifier IDs on the front end to allow them to be manipulated. During debugging something is driving me crazy: The GUIDs in the db are stored in uppercase, however by the time they make it to the front end they’re in lowercase.

This means I can’t quickly copy and paste IDs into the browser’s console to execute JS on the fly when devving/debugging. I have found a just-about-workable way of doing this but I was wondering if anyone knew why this behaviour is the case and whether there is any way of forcing GUIDs to stay uppercase.

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1 Answer

  1. Editorial Team

    According to MSDN docs the Guid.ToString() method will produce lowercase string.

    As to why it does that – apparently RFC 4122 states it should be this way.

    The hexadecimal values “a” through “f” are output as lower case characters and are case insensitive on input.

    Also check this question on SO – net-guid-uppercase-string-format.

    So the best thing you can do is to call ToUpper() on your GUID strings, and add extension method as showed in the other answer.

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