NULL object in vb.net

how to check whether an object/string exist....

if possible help me with a code

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.

Quote:

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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.

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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..