Check Variable

[Guest]

Hi
What is the best way to check if a 'String' variable is null or empty? I was usin

If strValue.Empty Then ..

But I am getting an error.

 

[Ken Tucker [MVP]]

Hi,

Dim s As String

If s Is Nothing Then

MessageBox.Show("Empty String")

End If



Ken

 

[Scott]

Null and Empty are two different things. 'Null' means the String object
hasn't been set to an instance of a String. 'Empty' is a member of the
String class representing the zero-length string "". Try the following...

If Not strValue Is Nothing Then
If strValue Is String.Empty Then
MessageBox("String is empty")
Else
MessageBox("String has a value")
End If
Else
MessageBox("String is null, or Nothing")
End If

 

[Cor]

Hi Ken,

You should be happy that Armin is not here,

In my opinion the explanation from Scott the correct one.

(I do this also for the OP)

Cor

 

[Herfried K. Wagner [MVP]]

Cor,

You should be happy that Armin is not here,

Mhm... Seems to be on holiday.

In my opinion the explanation from Scott the correct one.

Depends on what definition you base your code...

(I do this also for the OP)

Full ACK.