How to drag/drop labels ,that created at run time

this is my code ...

Private Sub server1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles server1.Click
        'create new form 
        Dim ser1 As New Form
        Dim l1 As New Label()
        ser1.Location = New Point(123, 28)
        ser1.Height = 95
        ser1.Width = 206

            l1.AllowDrop = True
            l1.Name = "Lab1"
            l1.Text = "label1"
            l1.Location = New Point(5, 5 )


        l1.DoDragDrop(l1, DragDropEffects.Move)
    End Sub

 Private Sub picturebox3_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles server3.DragEnter
        If (e.Data.GetDataPresent(DataFormats.Text)) Then
            ' Display the copy cursor.
            e.Effect = DragDropEffects.Copy
            ' Display the no-drop cursor.
            e.Effect = DragDropEffects.None
        End If

    End Sub

I know this way
but how I can implement mouse clicking and moving to labels created at run time ???

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