C# Signature:

[DllImport("user32.dll")]
static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey,
   byte bAlpha, uint dwFlags);

VB Signature:

Public Declare Auto Function SetLayeredWindowAttributes Lib "User32.Dll" _
    (ByVal hWnd As IntPtr, ByVal crKey As Integer, ByVal Alpha As Byte, ByVal dwFlags As Integer) As Boolean

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

When setting Layered Window Attributes for window transparency, you can set the .Transparency property of your form instead.

Sample Code:

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Alternative Managed API:

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