private void button1_Click(object sender, EventArgs e)
    {
        string connect = "server=localhost;username=root;database=users;password=;";
        MySqlConnection connection = new MySqlConnection(connect);
        connection.Open();
        string zapros = "SELECT email FROM users.data WHERE email='" + textBox1.Text + "'";
        string updatepassword = "UPDATE `users`.`data` SET `password`='1122334455' WHERE `email`='" + textBox1.Text + "';";
        MySqlCommand command = new MySqlCommand(zapros, connection);
        MySqlCommand command1 = new MySqlCommand(updatepassword, connection);
        try
        {
            string resul = command.ExecuteScalar().ToString();
            string updpass = command1.ExecuteScalar().ToString();

        }
        catch (Exception ex)
        {
            MessageBox.Show("Такого нет!");
        }