public static async Task <TlFile> GetFile(this ITelegramClient client, TlAbsInputFileLocation location, int filePartSize, int offset = 0)
        {
            try
            {
                return(await client.SendRequestAsync <TlFile>(new TlRequestGetFile
                {
                    Location = location,
                    Limit = filePartSize,
                    Offset = offset
                }));
            }
            catch (FileMigrationException ex)
            {
                var exportedAuth =
                    await client.SendRequestAsync <TlExportedAuthorization>(new TlRequestExportAuthorization { DcId = ex.Dc });

                var clientSettings = client.GetSettings();
                Guard.That(clientSettings).IsNotNull();
                Guard.That(clientSettings.Session).IsNotNull();

                var authKey       = clientSettings.Session.AuthKey;
                var timeOffset    = clientSettings.Session.TimeOffset;
                var serverAddress = clientSettings.Session.ServerAddress;
                var serverPort    = clientSettings.Session.Port;

                await client.ReconnectToDcAsync(ex.Dc);

                await client.SendRequestAsync <TlAuthorization>(new TlRequestImportAuthorization
                {
                    Bytes = exportedAuth.Bytes,
                    Id    = exportedAuth.Id
                });

                var result = await client.GetFile(location, filePartSize, offset);

                clientSettings.Session.AuthKey       = authKey;
                clientSettings.Session.TimeOffset    = timeOffset;
                clientSettings.Session.ServerAddress = serverAddress;
                clientSettings.Session.Port          = serverPort;
                await client.ConnectAsync();

                return(result);
            }
        }
 public bool Authorize()
 {
     _client.ConnectAsync().Wait();
     return(_client.IsUserAuthorized());
 }