how to check if a string is null or empty in VB .net

In VB .net how can I check a string to see if it is null or empty? I have a class object with a string property.
is this correct?

If (myObject.Str IsNot String.IsNullOrEmpty) Then
' Do something
End If
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Martin MillerCTOCommented:
Do you have access to string compare function... if YES, then a couple compares manually can confirm:
--> with "" , just 2 double quotes. and compare with (ZERO)  0 the number
Fernando SotoRetiredCommented:
This should do what you need.
If String.IsNullOrEmpty(StringToTest) Then
   Return "is null or empty"
   ‘’ Process the string here
End If

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Visual Basic.NET

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