// https://www.codeproject.com/Answers/1174965/How-can-I-make-my-form-like-windows-blurr-effect-o#answer3
public static void enableBlur(this Form @this)
{
var accent = new Win32Util.AccentPolicy();
accent.AccentState = Win32Util.AccentState.ACCENT_ENABLE_BLURBEHIND;
var accentStructSize = Marshal.SizeOf(accent);
var accentPtr = Marshal.AllocHGlobal(accentStructSize);
Marshal.StructureToPtr(accent, accentPtr, false);
var Data = new Win32Util.WindowCompositionAttributeData();
Data.Attribute = Win32Util.WindowCompositionAttribute.WCA_ACCENT_POLICY;
Data.SizeOfData = accentStructSize;
Data.Data = accentPtr;
Win32Util.SetWindowCompositionAttribute(@this.Handle, ref Data);
Marshal.FreeHGlobal(accentPtr);
}
