private void LOGIN_Click(object sender, EventArgs e)
        {
            Int64 count;
            Int64 reg;
            //        MessageBox.Show(TEACH.Text);
             //       MessageBox.Show(STUD.Text);
            if (UNAME.Text != "" & PASS.Text != "" & PROF.Text == "STUDENT")
            {
                com.Connection = con;
                com.CommandText = "select RNO  from sprofile where PASS= '******' ";
                reg = Convert.ToInt64(UNAME.Text);
                count = Convert.ToInt64(com.ExecuteScalar());

                if (count == reg)
                {
                    course f = new course();
                    f.Show();
                    Hide();
                }
                else
                    MessageBox.Show("wrong password or username");
            }
            else
                if (UNAME.Text != "" & PASS.Text != "" & PROF.Text == "TEACHER")
                {
                    com.Connection = con;
                    com.CommandText = "select TID  from tprofile where PASS= '******' ";
                    count = Convert.ToInt32(com.ExecuteScalar());
                     reg = Convert.ToInt32(UNAME.Text);
                    if (count == reg)
                    {
                        teacher_menu f = new teacher_menu();
                        f.Show();
                        Hide();
                    }
                    else
                        MessageBox.Show("wrong TEACHER ID OR PASSWORD");
                }
            else
                    MessageBox.Show("FILL ALL VALUES");

            UNAME.Text = "";
            PASS.Text = "";
            PROF.Text = "";
        }
 private void button3_Click(object sender, EventArgs e)
 {
     course f = new course();
     f.Show();
     Hide();
 }