Radio button list problem

[Daveeed]

Hey ! Whats wrong with this code? It gives me this error: Additional information: Object reference not set to an instance of an object. It gives me the error at this line:

rb(1) = New RadioButton()

Dim rb As List(Of RadioButton) = Nothing
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        rb(1) = New RadioButton()
        rb(2) = New RadioButton()
        rb(3) = New RadioButton()
        rb(4) = New RadioButton()
        rb(1).Location = vb1.Location
        rb(2).Location = vb2.Location
        rb(3).Location = vb3.Location
        rb(4).Location = vb4.Location
        For i As Integer = 1 To 4
            My.Forms.Form1.Controls.Add(rb(i))
        Next
End Sub

Thank you very much guys, I need this for a projekt to school