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IsEmpty Variable Testing Function

Before you can do anything with a variable, it must exist. This function helps ensure that session variables and the like have been initialized before you try to use them.

If you had a variable called LogonID, your syntax would be:

NoLogon = IsEmpty(LogonID)

if NoLogon = TRUE then
response.write "you must log on before you view this page."
end if

ASP Variable Testing Functions