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February 12th, 2008, 02:21 AM
#1
NULL object in vb.net
how to check whether an object/string exist....
if possible help me with a code
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February 12th, 2008, 10:28 AM
#2
Re: NULL object in vb.net
With an object you usually do If ObjectVar Is Nothing Then...
A string could be checked for empty like If StringVar = vbNullString Then
where also If StringVar = "" Then... gives the same result, I think.
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February 12th, 2008, 11:23 AM
#3
Re: NULL object in vb.net
Originally Posted by WoF
With an object you usually do If ObjectVar Is Nothing Then...
A string could be checked for empty like If StringVar = vbNullString Then
where also If StringVar = "" Then... gives the same result, I think.
100% correct.
the only difference is a Null string has no allocated memory, and can cause errors when passed to a API.
check under NULL's in this article for more info..
Gremmy..
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