How to delete this register key

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VB

I am trying to delete this key but how .

This is how i read the key , how to delete this ?

Dim readValue As String
        readValue = My.Computer.Registry.GetValue _
        ("HKEY_CURRENT_USER\Software\VB and VBA Program Settings\TestKey", "TestValue", Nothing)
        Label1.Text = readValue

this is not working.

Try
           Dim key As Microsoft.Win32.RegistryKey
           key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("Software\VB and VBA Program Settings\TestKey", True)

           key.DeleteValue("TestValue")
       Catch ex As Exception

       End Try