I plan to create a class library for vb.net so I have the C# code source but there is an error So I have to fix the c# code source so that I can convert it to vb.net Please guide me to solve errors in the source code C#

Thanks

public partial class Form1 : Form
    {
        [DllImport("dwmapi.dll")]
        private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);

        private static bool IsWindows10OrGreater(int build = -1)
        {
            return true;
        }

        private static bool UseImmersiveDarkMode(IntPtr handle, bool enabled)
        {
            try
            {
                if (Form1.IsWindows10OrGreater(17763))
                {
                    int attr = 19;
                    if (Form1.IsWindows10OrGreater(18985))
                    {
                        attr = 20;
                    }
'error below line code
                    int num = (enabled > false) ? 1 : 0;
                    return Form1.DwmSetWindowAttribute(handle, attr, ref num, 4) == 0;
                }
            }
            catch (Exception)
            {
            }
            return false;
        }
      
        public Form1()
        {
            InitializeComponent();
        }
    }