private async void FrmMain_Load(object sender, EventArgs e) { try { string sessionPath = Path.Combine(Application.StartupPath, @"session.dat"); Store.Load(sessionPath); client = new TelegramClient(35699, "c5faabe85e286bbb3eac32df78b34517", Store, sessionPath); bool connectResult = await client.ConnectAsync(); if (connectResult == false) { this.Text = this.Text + " Failed to login"; } else { this.Text = this.Text + " Login success"; try { var client = NewClient(); await client.ConnectAsync(); var result = await client.GetContactsAsync(); //find recipient in contacts var user = result.users.lists.ToList() .Where(x => x.GetType() == typeof(TLUser)) .Cast <TLUser>() .FirstOrDefault(x => x.self); var photo = ((TLUserProfilePhoto)user.photo); var photoLocation = (TLFileLocation)photo.photo_small; var resFile = await client.GetFile(new TLInputFileLocation() { local_id = photoLocation.local_id, secret = photoLocation.secret, volume_id = photoLocation.volume_id }, 100000, 0); Bitmap image; using (MemoryStream stream = new MemoryStream(resFile.bytes)) { image = new Bitmap(stream); } pbSelfPicture.Image = image; } catch (Exception) { } // pictureBox1.Image = ByteToImage( resFile.bytes); } } catch (Exception ex) { MessageBox.Show(ex.Message, string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Error); } }