@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The SetLayeredWindowAttributes API !!!!C# Signature: [DllImport("user32.dll")] public 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: [Flags] public enum LayeredWindowFlags { LWA_ALPHA = 0x00000002, LWA_COLORKEY = 0x00000001, } !!!!Notes: A layered window is created by specifying WS_EX_LAYERED when creating the window with the CreateWindowEx function or by setting WS_EX_LAYERED via SetWindowLong after the window has been created. Windows 8: The WS_EX_LAYERED style is supported for top-level windows and child windows. Previous Windows versions support WS_EX_LAYERED only for top-level windows. !!!!Tips & Tricks: !!!!C# Sample Code: public const int GWL_EXSTYLE = -20; public const int WS_EX_LAYERED = 0x80000; public const int LWA_ALPHA = 0x2; public const int LWA_COLORKEY = 0x1; //set the window style to alpha appearance private void button4_Click(object sender, EventArgs e) { SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) ^ WS_EX_LAYERED); SetLayeredWindowAttributes(Handle, 0, 128, LWA_ALPHA); } !!!!Alternative Managed API: If you just want to change the transparency of a Form you own, then use the Opacity property. Documentation: SetLayeredWindowAttributes@msdn on MSDN
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