これを試して:
Public Class Form1
Dim numberOfRecords As Integer
Dim questionArray() As Integer
Dim count As Integer = 0
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
' Do logic here to load data from database
' Set the binding navigator's MoveNextItem property to nothing, because we are going to randomize the order instead of stepping through in order
BindingNavigator.MoveNextItem = Nothing
' Get the number of records here from binding source
numberOfRecords = BindingSource.Count
' Re-dimension array to size for total number of records
ReDim questionArray(numberOfRecords)
' Initialize array of questions
For i = 0 To numberOfRecords - 1
questionArray(i) = i + 1
Next
' Randomize the question array by moving items around
For i = 0 To numberOfRecords - 1
Dim swap As Integer = Int(((numberOfRecords - 1) * Rnd()) + 1)
Dim num As Integer = questionArray(i)
questionArray(i) = questionArray(swap)
questionArray(swap) = num
Next
End Sub
Private Sub BindingNavigatorMoveNextItem_Click(sender As System.Object, e As System.EventArgs) Handles BindingNavigatorMoveNextItem.Click
BindingSource.Position = questionArray(count)
' Set the stopping point
If count < numberOfRecords - 1 Then
count = count + 1
End If
End Sub
End Class