Prestwood IT: VB.Net Empty String Check (String.IsNullOrEmpty) (VB.Net Language)

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VB.Net Empty String Check (String.IsNullOrEmpty)

By Mike Prestwood

Posted 15 years ago on 9/19/2009

VB.Net Code Snippet:

To/From Code Guide: VB.Net Empty String ... vs. Other Languages

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Tags: VB.Net , Empty String Check

KB102045

Languages Focus: Empty String Check

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 Empty String Check

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:

Dim s As String

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

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

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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Linked Certification Question(s)

The following are practice certification questions with answers highlighted. These questions were prepared by Mike Prestwood and are intended to stress an important aspect of this KB post. All our practice questions are intended to prepare you generally for passing any certification test as well as prepare you for professional work.

Beginner

1 Beginner Level Question

Question #1: True or False?

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.

Answer:

True

False

KB Article #102045 Counter

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Since 9/19/2009