Passing Array to Another Form (vb.net) - vb.net

Question

I got a form which declared an array in public,
Public requestedqueue() As Integer
I would like to pass the array to form3 and perform other calculations there, but how?
I tried doing(at a new form):
public newrequest() As Integer
newrequest = form2.requestedqueue
I tried to show it at a new form by doing:
TextBox1.Text = = String.Join(",",form2.newrequest)
But whenever I run into form3 it would say the newrequest is null.
But it shows as an array in form2, Im so confused.

Answer 1

I'm not sure what you mean by
But it shows as an array in form2
but newrequest will be Nothing because you have set it equal to the value of requestedqueue which is Nothing until you populate the array with some values.
If you had Public requestedqueue() As Integer = {1, 2, 3} then you would not encounter the error.

Answer 2

One way to pass data to a form is to add a property to the second form.
Lets say you have a form called Form3 and this is your form's code. In the code you will need to declare an array of integer to hold the passed data, and also declare a public property so you have a way of passing the array
Public Class Form3
Dim requestedqueue() As Integer
Public Property ArrayParameter As Integer()
Get
Return arrayData
End Get
Set(value() As Integer)
arrayData = value
End Set
End Property
End Class
Then, to pass the data from Form1, in form1, you would simply use
Form3.ArrayParameter=requestedqueue()
to set the parameter.
and if you wish, you can show the form as normal, or if the form is already visible, you can process the code using button clicks etc.
If you want to process the data in an already open form immediately without any user interaction, you can write a Procedure that does the processing and include that in the Set portion of your property.
For example. If you want to add all the elements of the array to a ListBox called ListBox1 in Form3, you could write a procedure like this..
Private Sub AddDataToListbox()
ListBox1.Items.Clear()
For Each item As Integer In requestedqueue
ListBox1.Items.Add(item)
Next
End Sub
and change your Form3.ArrayParameter code to this
Public Property ArrayParameter As Integer()
Get
Return requestedqueue
End Get
Set(value() As Integer)
requestedqueue = value
AddDataToListbox()
End Set
End Property