private void button10_Click(object sender, EventArgs e)
        {
            string error;

            if (textBox1.Visible)
            {
                repo.ModifyAddress(id, textBox1.Text, out error);
            }
            else if (textBox2.Visible)
            {
                repo.ModifyContactNo(id, textBox2.Text, out error);
            }
            else if (textBox3.Visible)
            {
                repo.ModifyEmail(id, textBox3.Text, out error);
            }
            else if (textBox4.Visible)
            {
                repo.ModifyPost(id, textBox4.Text, out error);
            }
            else if (textBox5.Visible)
            {
                repo.ModifyWorkingDays(id, textBox5.Text, out error);
            }
            else if (textBox6.Visible)
            {
                repo.ModifyWorkingHours(id, textBox6.Text, out error);
            }
            else if (textBox7.Visible)
            {
                repo.ModifyReportingTime(id, textBox7.Text, out error);
            }
            else if (textBox8.Visible)
            {
                repo.ModifyLeavingTime(id, textBox8.Text, out error);
            }

            this.Visible = false;
            Form7 b2 = new Form7();

            b2.Visible = true;
        }