WindowHelper.Win32Window.AddBorder C# (CSharp) Method

        public void AddBorder()
        {
            int style = WinAPI.GetWindowLong(this.Handle, WinAPI.GWL_STYLE);
            WinAPI.SetWindowLong(this.Handle, WinAPI.GWL_STYLE, (style & WinAPI.WS_THICKFRAME));
        }