collision of picturebox array

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VB

In my code i used a button to create a picturebox & it can move. I want to avoid overlapping of any pictureboxes created in the form.i used timer for it but i am having a trouble to avoid overlapping & i cant apply array in the intersectwith().

Public Class Form1
    Dim pic As New List(Of PictureBox)
    Dim mousex, mousey As Integer
    Dim drag As Boolean = False
    Private Sub pic_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        If e.Button = Windows.Forms.MouseButtons.Left Then
            Me.Cursor = Cursors.Hand
            drag = True
            mousex = -e.X
            mousey = -e.Y
            Dim left As Integer = Me.PointToClient(MousePosition).X - sender.location.x
            Dim right As Integer = Me.PointToClient(MousePosition).Y - sender.location.y
            Dim width As Integer = Me.ClientSize.Width - (sender.width - left)
            Dim height As Integer = Me.ClientSize.Height - (sender.width - right)
            Windows.Forms.Cursor.Clip = Me.RectangleToScreen(New Rectangle(left, right, width, height))
            sender.invalidate()
        End If
    End Sub

    Private Sub pic_Mousemove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        If drag Then
            Dim mposition As New Point()
            mposition = Me.PointToClient(MousePosition)
            mposition.Offset(mousex, mousey)
            sender.location = mposition
        End If
    End Sub

    Private Sub pic_Mouseup(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
        drag = False
        Windows.Forms.Cursor.Clip = Nothing
        Me.Cursor = Cursors.Arrow
        sender.invalidate()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        If pic(1).Bounds.IntersectsWith(pic(2).Bounds) Then
            Button1.Enabled = False
        Else
            pic(1).Enabled = True
        End If
    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim a As New PictureBox
        a.Image = Image.FromFile("C:\Users\Rose\Desktop\pic.jpeg")
        Dim pic = a
        Me.Controls.Add(pic)
        AddHandler pic.MouseDown, AddressOf pic_MouseDown
        AddHandler pic.MouseMove, AddressOf pic_Mousemove
        AddHandler pic.MouseUp, AddressOf pic_Mouseup
    End Sub
End Class