private void btnSign_Click(object sender, RoutedEventArgs e)
        {
            var user = people.Where(i => i.Login == tbLog.Text && i.Password == tbPass.Text).FirstOrDefault();

            if (user != null && !truecapcha)
            {
                if (chbRememb.IsChecked == true)
                {
                    using (StreamWriter streamWriter = new StreamWriter(path))
                    {
                        streamWriter.Write(tbLog.Text + " " + tbPass.Text);
                        streamWriter.Close();
                    }
                }
                WindowSing windowSing = new WindowSing(user);
                windowSing.ShowDialog();
            }

            else if (user != null && truecapcha)
            {
                if (txtCapch.Text == tbCapch.Text)
                {
                    WindowSing windowSing = new WindowSing(user);
                    windowSing.ShowDialog();
                }
            }

            else
            {
                MessageBox.Show("Пользователь не найден.");

                txtCapch.Text        = GetString.GetCapcha();
                tbCapch.Visibility   = Visibility.Visible;
                txtCapch1.Visibility = Visibility.Visible;
                txtCapch.Visibility  = Visibility.Visible;
                imgCapcha.Visibility = Visibility.Visible;
                btnCapch.Visibility  = Visibility.Visible;

                truecapcha = true;
            }
        }
 private void btnCapch_Click(object sender, RoutedEventArgs e)
 {
     txtCapch.Text = GetString.GetCapcha();
 }