Hello,

I'm starting with vb.net and i get this error:
Object reference not set to an instance of an object

Dim t() As Integer
For i = 0 To 1000
t(i) = i
Next

Thanks
Bob

Dim t(1000) As Integer
For i = 0 To 1000
t(i) = i
Next


Meelis




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Thanks, but if i don't know in advance how many elements there will be ...

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Dim t() As Integer, i As Integer
For i = 0 To 1000
ReDim Preserve t(i)
t(i) = i
Next




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Thanks

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Bob,
In addition Meelis' sample.

Consider using an ArrayList (.NET 1.x) or List(Of T) (.NET 2.0) instead.

Both are array like structures that dynamic grow "intelligently". They both
allocate a larger then needed buffer & only reallocate when the buffer in
full. Which is significantly more GC friendly then resizing the array on
each iteration of the loop.

    ' .NET 1.x
    Dim t As ArrayList
    ' .NET 2.x
    Dim t As List(Of Integer)
The ArrayList actually holds a list of Objects, so it is not very GC
friendly, nor type safe friendly, plus it has overridable methods which can
be a minor performance issue.

The List(Of Integer) holds a list of Integers, so it is very GC friendly,
fully type safe, plus avoids overriable methods eliminating that possible
performance issue...

FWIW: List(Of T) is a generic class, it is a strongly typed list of what
ever type you give for T. For example:

    List(Of Integer) = a strongly typed list of integers
    List(Of Double) = a strongly typed list of doubles
    List(Of Customer) = a strongly typed list of Customer objects


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