Comments by Dave Kreskowiak (Top 200 by date)

GCHandle handle = GCHandle.Alloc(person_1, GCHandleType.Pinned);
IntPtr address = handle.AddrOfPinnedObject();

public static string DocConvertionUrl = "https://xxx.com/doc2pdf";

        private Task AttemptToOpenAsync(string filepath)
        {
            return Task.Factory.StartNew(() =>
            {
                bool available = false;

                while (!available)
                {
                    available = IsAvailable(filepath);
                    Log($"IsAvailable: {available}");

                    if (!available)
                    {
                        Thread.Sleep(1000);
                    }
                }

                return available;
            });
        }

        private bool IsAvailable(string filepath)
        {
            bool result = false;

            try
            {
                using (FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.None))
                {
                    result = true;
                }
            }
            catch (FileNotFoundException ex)
            {
                // Log(ex.Message);
            }
            catch (IOException ex)
            {
                // Log(ex.Message);
            }

            return result;
        }