[yjmn]

اخي استخدم هذا الكود

Private Declare Function SetLayeredWindowAttributes Lib "user32.dll" (ByVal hwnd As Long, ByVal ByValcrKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Boolean

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Const LWA_ALPHA = 2
Const GWL_EXSTYLE = (-20)
Const WS_EX_LAYERED = &H80000


Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Me.BackColor = Color.White
Me.TransparencyKey = Color.White
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.None
SetWindowLong(0, GWL_EXSTYLE, GetWindowLong(0, GWL_EXSTYLE) Or WS_EX_LAYERED)
SetLayeredWindowAttributes(0, 0, 128, LWA_ALPHA)

End Sub