private void btnBack_Click(object sender, EventArgs e)
        {
            this.Visible = false;
            professor_home professor_home = new professor_home();

            professor_home.Show();
        }
        private void btnLogin_Click(object sender, EventArgs e)
        {
            MySqlConnection cn = new
                                 MySqlConnection
                                     ("datasource=localhost;port=3306;database='stafford';username=root;password="******"SELECT `username`, `password` FROM `students` WHERE `username` = '" + txtUserName.Text + "' AND `password` = '" + txtPasswod.Text + "'", cn);
            adapter.Fill(table);



            if (txtPasswod.Text == "")
            {
                string message = "Please enter a Password";
                string title   = "Error!";
                MessageBox.Show(message, title);
            }

            else if (txtPasswod.Text == "")
            {
                string message = "Please enter a Password a User Name";
                string title   = "Error!";
                MessageBox.Show(message, title);
            }

            else if (txtPasswod.Text == "1234" && txtUserName.Text == "admin")
            {
                this.Visible = false;
                Registar_home Registar_home = new Registar_home();
                Registar_home.Show();
            }

            else if (table.Rows.Count == 1)
            {
                string message = "Welcome to Stafford";
                string title   = "Student Identified";
                MessageBox.Show(message, title);

                this.Visible = false;
                Student_Home Student_Home = new Student_Home();
                Student_Home.Show();
            }


            else
            {
                adapter = new MySqlDataAdapter("SELECT `username`, `password` FROM `professors` WHERE `username` = '" + txtUserName.Text + "' AND `password` = '" + txtPasswod.Text + "'", cn);
                adapter.Fill(table);


                if (table.Rows.Count == 1)

                {
                    string message = "Welcome to Stafford";
                    string title   = "Professor Identified";
                    MessageBox.Show(message, title);


                    this.Visible = false;
                    professor_home Professor_Home = new professor_home();
                    Professor_Home.Show();
                }


                else
                {
                    string message = "User Password or Username is incorrect";
                    string title   = "Error!";
                    MessageBox.Show(message, title);
                }
            }
        }