Eliminating IsEmpty and IsNull Issues in ASP

When dealing with COM, unfamiliar database schemas, or regular code, sometimes you will find yourself wondering whether to test if a variable is Null by using either:

 IsEmpty(varname)IsNull(varName)If varname = 0If varname <> 0, orIf varname > 0

This little quick trick will eliminate all of those issues and allow you to quickly move on to more pressing issues. Simply convert the variable to a string and check the length. Here is a quick sample:

 If Len(varname & "") < 1

or you can use:

 If Len(varname & "") = 0

or you can also do:

 If Len(varname & "") <> 0

Either way, if it's equal to 0 then it was empty or null, but you've eliminated type mismatch errors that can cause delays in development.

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