Based on Win32-Acrylic-Effect.

Usage:

public partial class AcrylicForm : Form
{
	[DllImport("AcrylicWindow.dll")]
	public static extern void ApplyAcrylic(IntPtr hWnd, int radius = 70, float saturation = 1.5f);
	[DllImport("AcrylicWindow.dll")]
	public static extern void SyncWindowPosition(IntPtr hWnd);

	public AcrylicForm()
    {
        InitializeComponent();
		ApplyAcrylic(Handle);
		Move += (s, e) => SyncWindowPosition(Handle);
	}
}