Vb.net drag window without titlebar

Public Const WM_NCLBUTTONDOWN As Integer = &HA1 
Public Const HT_CAPTION As Integer = &H2 

<DllImportAttribute("user32.dll")> _ 
Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
End Function

<DllImportAttribute("user32.dll")> _ 
Public Shared Function ReleaseCapture() As Boolean
End Function

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown, Panel1.MouseDown 
    If e.Button = Windows.Forms.MouseButtons.Left Then
        ReleaseCapture() 
        SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0) 
    End If
End Sub

Source: stackoverflow.com

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