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In C#, Is null, "", and string.Empty the exact same thing described 3 different ways?

Tom Knowlton
Tom Knowlton asked
Last Modified: 2018-10-01
Is null, "" and string.Empty the exact same thing?  Please explain your answer.

CommonHelpers.LastWorkingProjectID == null || CommonHelpers.LastWorkingProjectID == "" || CommonHelpers.LastWorkingProjectID == string.Empty

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