[DllImport("user32.dll", EntryPoint = "GetWindowLong")]
public static extern long GetWindowLong(IntPtr hwnd, int nIndex);
[DllImport("user32.dll", EntryPoint = "SetWindowLong")]
public static extern long SetWindowLong(IntPtr hwnd, int nIndex, long dwNewLong);
[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
private static extern int SetLayeredWindowAttributes(IntPtr Handle, int crKey, byte bAlpha, int dwFlags);
const int GWL_EXSTYLE = -20;
const int WS_EX_TRANSPARENT = 0x20;
const int WS_EX_LAYERED = 0x80000;
const int LWA_ALPHA = 2;
SetWindowLong(this.Handle, GWL_EXSTYLE, GetWindowLong(this.Handle, GWL_EXSTYLE) | WS_EX_TRANSPARENT | WS_EX_LAYERED);
SetLayeredWindowAttributes(this.Handle, 0, 128, LWA_ALPHA);
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