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► KB ► To/From Guides ► VB.Net ► Operators

Empty String Check (Cross Ref > Operators)

By Mike Prestwood

VB.Net versus JavaScript: A side by side comparison between VB.Net and JavaScript.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Empty String Check

[Other Languages]

Languages Focus

An empty string is a zero length string, a string that is equal to null (""), or not assigned. In some languages, you can check if a string is empty by comparing it to an empty string (""). Some languages distinguish between nil and null ("") so checking if the length is 0 is easier.

VB.Net: String.IsNullOrEmpty

In .Net, a string can be null or empty. The .Net framework offers a static method in the string class: String.IsNullOrEmpty to check if a string is null or empty.

Syntax Example: 1 certification question.

Dim s As String

's = "" 'Uncomment to test 2nd case.

If String.IsNullOrEmpty(s) Then
  MessageBox.Show("hello")
End If

[Not specified yet. Coming...]