NULL object in vb.net

[msaravanan]

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

if possible help me with a code

[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.

[GremlinSA]

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.. (http://www.codeguru.com/vb/vbnet30/article.php/c13373/)

Gremmy..