dim as Vs. dim as new

[Sameh Ahmed]

Hello there
what's the difference between dim as and dim as new?
Thanks in advance
Regards
Sameh

[Doknjas]

Dim As New ... creates the object instance

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[Doknjas]

Dim As New ... creates the object instance

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[Armin Zingler]

"Sameh Ahmed" <es******@hotmail.com> schrieb

what's the difference between dim as and dim as new?

There is no difference with value types (Integer, Double, Structures, ...).
The instance is created anyway in both cases.

There is a difference with reference types: Without new, only the space for
the variable is reserved (currently 4 bytes = 32 bits). No object is
created. The variable contains Nothing (= no reference). With New, it is
equal to
dim o as type
o = new type
which means it also creates an object and stores the reference to the object
in o.
--
Armin

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[Armin Zingler]

"Sameh Ahmed" <es******@hotmail.com> schrieb

what's the difference between dim as and dim as new?

There is no difference with value types (Integer, Double, Structures, ...).
The instance is created anyway in both cases.

There is a difference with reference types: Without new, only the space for
the variable is reserved (currently 4 bytes = 32 bits). No object is
created. The variable contains Nothing (= no reference). With New, it is
equal to
dim o as type
o = new type
which means it also creates an object and stores the reference to the object
in o.
--
Armin

How to quote and why:
http://www.plig.net/nnq/nquote.html
http://www.netmeister.org/news/learn2quote.html

[post2shan]

Dim objSome as Something

-This declare the objSome but memory was not allocated.

Dim objSome as new Something

-This declare and allocate memory for the object.

:new is the keyword in .net to allocate memory for the declared object.


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[post2shan]

Dim objSome as Something

-This declare the objSome but memory was not allocated.

Dim objSome as new Something

-This declare and allocate memory for the object.

:new is the keyword in .net to allocate memory for the declared object.


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Comprehensive, categorised, searchable collection of links to ASP & ASP.NET resources...