private void BtnLogIn_Click(object sender, EventArgs e)
        {
            sql_Connection cnt     = new sql_Connection();
            SqlCommand     command = new SqlCommand("select * from Tbl_Secretaries where SecretaryTC=@p1 and SecretaryPassword=@p2", cnt.connect());

            command.Parameters.AddWithValue("@p1", STC.Text);
            command.Parameters.AddWithValue("@p2", SPassword.Text);

            SqlDataReader rdr = command.ExecuteReader();

            if (rdr.Read())
            {
                FrmSecretaryDetail fr = new FrmSecretaryDetail();

                fr.tc = STC.Text;
                fr.Show();
                this.Close();
            }
            else
            {
                MessageBox.Show("TC no or Password is wrong...", "Error",
                                MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            cnt.connect().Close();
        }
        private void FrmPEditInfo_Load(object sender, EventArgs e)
        {
            sql_Connection cnt     = new sql_Connection();
            SqlCommand     command = new SqlCommand("select * from Tbl_Patients where PatientTC='" + TCno + "'", cnt.connect());
            SqlDataReader  rdr     = command.ExecuteReader();

            while (rdr.Read())
            {
                PTC.Text       = rdr[0].ToString();
                Pname.Text     = rdr[1].ToString();
                PSurname.Text  = rdr[2].ToString();
                PTel.Text      = rdr[3].ToString();
                PPassword.Text = rdr[4].ToString();
                PGender.Text   = rdr[5].ToString();
            }
            cnt.connect().Close();
        }
        private void BtnEdit_Click(object sender, EventArgs e)
        {
            sql_Connection cnt     = new sql_Connection();
            SqlCommand     command = new SqlCommand("update Tbl_Patients set PatientName=@p1, PatientSurname=@p2, PatientNo=@p4, PatientPassword=@p5, PatientGender=@p6 where PatientTC=@p3", cnt.connect());

            if (Pname.Text.Equals("") | PSurname.Text.Equals("") | PTel.Text.Equals("") |
                PPassword.Text.Equals("") | PGender.Text.Equals(""))
            {
                MessageBox.Show("Please fill the blanks...", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                command.Parameters.AddWithValue("@p1", Pname.Text);
                command.Parameters.AddWithValue("@p2", PSurname.Text);
                command.Parameters.AddWithValue("@p4", PTel.Text);
                command.Parameters.AddWithValue("@p5", PPassword.Text);
                command.Parameters.AddWithValue("@p6", PGender.Text);
                command.ExecuteNonQuery();
                cnt.connect().Close();
                MessageBox.Show("Your information was updated...", "Information", MessageBoxButtons.OK);
            }
        }