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BOOK: Beginning ASP.NET 4 : in C# and VB
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Old November 20th, 2010, 11:56 AM
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Default VB questions, around pg 185-ish

Hi Imar,
Got several VB beginners questions on some of the code regarding objects, propertys, etc. Probably best if I just ask them one at a time, so the first is this statement...
dim myCalculator As calculator = new calculator()
Isn't the 2nd Calculator redundant? You've already specified the class as Calculator with the 1st reference, and you've said this is a new instance -- so, what's the purpose of the 2nd reference?

Jeff S
Old November 20th, 2010, 12:05 PM
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VB (and other .NET languages) require this in order to specify the real type that is assigned to the variable. Since, because of object orientation, it's possible to assign a different type than the type of the variable, you need to be explicit. E.g. this would work as well:

Dim myCalculator As Object = New Calculator()

However, from that point on, myCalculator behaves as an Object unless you cast it back to a calculator.

As explained in the book, VB supports a short hand syntax:

Dim myCalculator As New Calculator()

This is functionally equivalent.

Hope this helps,

Imar Spaanjaars
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Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
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