Prestwood IT: Setting to null or empty and checking (ASP Classic Coding)

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From the September 2009 Issue of Prestwood eMag

ASP Classic:

Setting to null or empty and checking

By Mike Prestwood

Posted 21 years ago on 4/4/2003 and updated 8/2/2007

Take Away: Use IsEmpty or Len > 0 to test
When clearing, set to Null (not "")

Tags: asp , remove session var , delete a session

KB100229

The general rule:

Use IsEmpty or Len > 0 to test

When clearing, set to Null (not "")

These rules allow you to check if a session var has a value, set it to null, and use it in mathematical expressions.

Here's some sample code demonstrating:

Const Test = "atest4"

Session(Test) = Null

Session(Test) = Session(Test) + 1

Response.Write "it is: " & Session(Test) Response.Write " Length: " & Len(Session(Test))

If Len(Session(Test)) > 0 then

	Response.Write " 	no-greater than zero"

else

	Response.Write " 	yes-not greater than zero"

end if

If IsEmpty(Session(Test)) then

 	Response.Write " 	no-empty"

else

 	Response.Write " 	yes-not empty"

end if


Comments 1 Comments. Share a thought or comment...

PS_3420

Comment 1 of 1

Setting to null or empty and checking. I think here is a complete change which attracts you the most. If you want to take a look on it then keep focus because it is helping you to understand your material and make your https://assignmentmasters.org/law-assignment/ work done. Hope you understand it well and after that we will be taking it more serious.

Posted 43 months ago

KB Post 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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