private void btnLogin_Click(object sender, EventArgs e)
    {
        progressPanel1.Visible = true;
        Thread thread = new Thread(new ThreadStart(logadmin));
        thread.Start();
    }

 public void logadmin()
    {
        if (string.IsNullOrWhiteSpace(tbUsername.Text))
        { MessageBox.Show("Enter username"); tbUsername.Focus(); }
        else if (string.IsNullOrWhiteSpace(tbPassword.Text))
        { MessageBox.Show("Enter password"); tbPassword.Focus(); }
        else
        {
            connection.Close();
            try
            {
                MySqlCommand cmd = new MySqlCommand("select * from usertbl where Username = '" + tbUsername.Text + "' and Password = '" + tbPassword.Text + "'", connection);
                connection.Open();
                reader = cmd.ExecuteReader();

                while (reader.Read())
                {
                    count = count + 1;
                }

                if (count == 1)
                {
                    Form1 ma = new Form1();
                    ma.Show();
                    connection.Close();
                    this.Hide();
                }
                else
                {
                    MessageBox.Show("Log-in Failed!");
                }
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }