VB.NET help with classes

[FlyingPenguin]

i am working on this transcript program for students.
i have a class called cSemester
on my form I need a bunch of semesters so i want to declare an array. The problem I am running into is that I can't delcare it properly.

dim sem(8) as cSemester

that will let me declare it. however, whenever i try to use any of the class's methods i get this error "Object reference not set to an instance of an object". So i then assumed its because i didn't create a new instance of the class by using the new keyword so i tried this

dim sem(8) as new cSemester

when i try to compile with that line it says "Arrays can not be declared with 'New'."

so my qestion is how do i declare an array of type cSemester?

 

[ibjhb]

Try/look into ReDim

You might be able to just ReDim or you might have to dim it with no array size and then ReDim it with the proper size.

 

[FlyingPenguin]

if i declare it without an inital size

dim sem() as new cSemester

it still doesn't work because it is still an array. it just doesn't have an intial size. If i declare it as not an array i can't redim it because it isn't initially an array

CURSES to VB !!!!!

 

[[MS]]

A couple of examples of instantiating an array of classes:

Module Module1

    Sub Main()
        Dim i As Integer

        Dim myArray1(5) As Foo
        For i = 0 To myArray1.GetUpperBound(0)
            myArray1(i) = New Foo(i)
        Next

        Dim myArray2() As Foo = New Foo() {New Foo(2), New Foo(4), New Foo(6)}

        show(myArray1)
        show(myArray2)

        Console.Read()
    End Sub

    Sub show(ByVal inArray As Foo())
        Dim i As Integer
        Console.WriteLine("Elements: {0}", inArray.GetUpperBound(0))
        For i = 0 To inArray.GetUpperBound(0)
            Console.Write("{0}  ", inArray(i).val)
        Next
        Console.WriteLine()
    End Sub

End Module

Class Foo
    Public val As Integer = 5
    Sub New(ByVal inVal As Integer)
        val = inVal
    End Sub
End Class