public int addProfessor(professor nProfessor)
        {
            try
            {
                connection.ConnectionString = c;

                connection.Open();

                OleDbCommand command = new OleDbCommand();

                command.Connection = connection;

                string query = "insert into Professor ([ProfessorID],[FName],[LName],[ClassTeaching]) values('" + nProfessor.getID + "','" + nProfessor.getfirstName + "','" + nProfessor.getlastName + "','" + nProfessor.getClass + "')";

                command.CommandText = query;

                command.ExecuteNonQuery();

                connection.Close();

                return(1);
            }
            catch (Exception ex)
            {
                string test = "Doesnt Work" + ex;
                return(-1);
            }
        }
        private void btnAddP_Click(object sender, EventArgs e)
        {
            int  test;
            bool result;

            if ((result = int.TryParse(txtpID.Text, out test) == false))
            {
                MessageBox.Show("Professor ID Must be interger!", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                int    professorID = Convert.ToInt32(txtpID.Text);
                string professorFN = txtpFN.Text;
                string professorLN = txtpLN.Text;
                string professorCT = txtCT.Text;

                professor nProfessor = new professor(professorID, professorFN, professorLN, professorCT);

                int value = Data.addProfessor(nProfessor);

                if (value == 1)
                {
                    txtpID.Text = "";
                    txtpFN.Text = "";
                    txtpLN.Text = "";
                    txtCT.Text  = "";

                    MessageBox.Show("Professor Data Added", "", MessageBoxButtons.OK);
                }
                else
                {
                    MessageBox.Show("Duplicate ID Number!!, Please restart this form again to enter correct one.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }