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MarcoAndresito
Asked: 2020-07-19 12:58:08 +0800 CST 2020-07-19 12:58:08 +0800 CST

How to validate null values ​​VB.net?

  • 772

How can I check if a variable is Null?

I already tried with:

If a Is null Then
 'a tiene valor nulo
Else
 'a es diferente de valor nulo
End If
vb.net

1 Answers

  1. Best Answer

    To validate the value nullin VB.net, it is used Nothingthat it basically represents the default value of the data type that is being used. validation would be

    If (a is Nothing) Then 
 ...
End If

    You could also use the IsNullOrEmpty method of the String class.

     If String.IsNullOrEmpty(a) Then
 . ..
 End If

    As a recommendation read this question and answer that details more in depth on this point

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