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   ► KBWebsite Scri...ASP Classic   Print This     
  From the September 2009 Issue of Prestwood eMag
 
ASP Classic:
Setting to null or empty and checking
 
Posted 16 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 "")

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

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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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