Exceptions are slow - is there a better way to test for valid objects?

[David Berman]

#1 - Is it just me or is catching an exception a very slooow thing?

#2 - Sometimes using certain API's you don't know if you have a valid
object or not, at least, I don't know how to test it. Sometimes for
example I'll do something like this:
if (excel_range.value2 != null)
DoSomethingWith(excel_range.value2)

and I'll get an exception indicating that I'm trying to use something
that isn't a reference to an object or that type of error. So, to see
if I got a valid excel_range, I basically have to test it by referencing
it in a try / catch block. This makes my program crawl. Isn't there a
better way to test for this sort of thing?

Thank you!
Neophyte C# developer Dave



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[Pat Cantey III]

if (excel_range.value2 != null)

DoSomethingWith(excel_range.value2)

Dave,

How about:

if (excel_range != null){
if(excel_range.value2 !=null)
DoSomethingWith(excel_range.value2)
}