`x <> Nothing` vs `x IsNot Nothing`

in VB is there any situation whereby x = Nothing is not the same as x is Nothing?

Also, x <> Nothing vs x IsNot Nothing

I'm thinking that they are p开发者_运维问答urely identical.. but just wanted to be sure.

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There's a difference with empty strings, which do count as Nothing with simply "=" or "<>" but don't count as Nothing for Is / IsNot:

Public Class Test
    Public Shared Sub Main()
        Dim x As String = ""
        Console.WriteLine(x = Nothing)   ' True
        Console.WriteLine(x Is Nothing)  ' False
    End Sub
End Class