

O título já diz tudo.
Public Class Form1
Private Const WM_NCLBUTTONDOWN = &HA1
Private Const HTCAPTION = 2
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Integer, ByVal wMsg As Integer, _
ByVal wParam As Integer, ByVal lParam As String) As Integer
Private Declare Sub ReleaseCapture Lib "user32" ()
'Deslocamento da PictureBox
Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
Dim lHwnd As Int32
lHwnd = PictureBox1.Handle
If lHwnd = 0 Then Exit Sub
ReleaseCapture()
SendMessage(lHwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0&)
End Sub
'Deslocamento da forma
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
Dim lHwnd As Int32
lHwnd = Me.Handle
If lHwnd = 0 Then Exit Sub
ReleaseCapture()
SendMessage(lHwnd, WM_NCLBUTTONDOWN, HTCAPTION, 0&)
End Sub
End Class
Clicar na pictureBox ou na forma e mover o mouse; mover o controle ou a forma.
Funciona com qualquer controle que tenha um Handle.