private void button_add_Click(object sender, EventArgs e)
        {
            if (employee == "Doctor")
            {
                ArrayList userInfo = new ArrayList();

                if (String.IsNullOrEmpty(textBox_name.Text) || String.IsNullOrEmpty(textBox_age.Text) ||
                    String.IsNullOrEmpty(textBox_dept.Text) || String.IsNullOrEmpty(textBox_qual.Text) ||
                    String.IsNullOrEmpty(textBox_exp.Text) || String.IsNullOrEmpty(textBox_salary.Text) ||
                    String.IsNullOrEmpty(textBox_phone.Text) || String.IsNullOrEmpty(richTextBox_address.Text))
                {
                    MessageBox.Show("Fill up all data");
                }

                else
                {
                    userInfo.Add(textBox_id.Text);
                    userInfo.Add(textBox_name.Text);
                    userInfo.Add(textBox_age.Text);
                    userInfo.Add(comboBox_gender.Text);
                    userInfo.Add(textBox_dept.Text);
                    userInfo.Add(textBox_qual.Text);
                    userInfo.Add(textBox_exp.Text);
                    userInfo.Add(textBox_salary.Text);
                    userInfo.Add(textBox_phone.Text);
                    userInfo.Add(richTextBox_address.Text);

                    DatabaseHelperClass ob = new DatabaseHelperClass(userInfo);

                    if (ob.addNewEmployee(employee))
                    {
                        MessageBox.Show("Doctor Added");
                    }
                    else
                    {
                        MessageBox.Show("Error Adding Doctor");
                    }
                }
            }

            else if (employee == "Receptionist")
            {
                ArrayList userInfo = new ArrayList();

                if (String.IsNullOrEmpty(textBox_name.Text) || String.IsNullOrEmpty(textBox_age.Text) ||
                    String.IsNullOrEmpty(textBox_dept.Text) || String.IsNullOrEmpty(textBox_qual.Text) ||
                    String.IsNullOrEmpty(textBox_exp.Text) || String.IsNullOrEmpty(textBox_salary.Text) ||
                    String.IsNullOrEmpty(textBox_phone.Text) || String.IsNullOrEmpty(richTextBox_address.Text))
                {
                    MessageBox.Show("Fill up all data");
                }

                else
                {
                    userInfo.Add(textBox_id.Text);
                    userInfo.Add(textBox_name.Text);
                    userInfo.Add(textBox_age.Text);
                    userInfo.Add(comboBox_gender.Text);
                    userInfo.Add(textBox_dept.Text);
                    userInfo.Add(textBox_qual.Text);
                    userInfo.Add(textBox_exp.Text);
                    userInfo.Add(textBox_salary.Text);
                    userInfo.Add(textBox_phone.Text);
                    userInfo.Add(richTextBox_address.Text);

                    DatabaseHelperClass ob = new DatabaseHelperClass(userInfo);
                    if (ob.addNewEmployee(employee))
                    {
                        MessageBox.Show("Receptionist Added");
                    }
                    else
                    {
                        MessageBox.Show("Error Adding Receptionist");
                    }
                }
            }

            else if (employee == "Nurse")
            {
                ArrayList userInfo = new ArrayList();

                if (String.IsNullOrEmpty(textBox_name.Text) || String.IsNullOrEmpty(textBox_age.Text) ||
                    String.IsNullOrEmpty(textBox_dept.Text) || String.IsNullOrEmpty(textBox_qual.Text) ||
                    String.IsNullOrEmpty(textBox_exp.Text) || String.IsNullOrEmpty(textBox_salary.Text) ||
                    String.IsNullOrEmpty(textBox_phone.Text) || String.IsNullOrEmpty(richTextBox_address.Text))
                {
                    MessageBox.Show("Fill up all data");
                }

                else
                {
                    userInfo.Add(textBox_id.Text);
                    userInfo.Add(textBox_name.Text);
                    userInfo.Add(textBox_age.Text);
                    userInfo.Add(comboBox_gender.Text);
                    userInfo.Add(textBox_dept.Text);
                    userInfo.Add(textBox_qual.Text);
                    userInfo.Add(textBox_exp.Text);
                    userInfo.Add(textBox_salary.Text);
                    userInfo.Add(textBox_phone.Text);
                    userInfo.Add(richTextBox_address.Text);

                    DatabaseHelperClass ob = new DatabaseHelperClass(userInfo);
                    if (ob.addNewEmployee(employee))
                    {
                        MessageBox.Show("Nurse Added");
                    }
                    else
                    {
                        MessageBox.Show("Error Adding Nurse");
                    }
                }
            }


            else if (employee == "Stuff")
            {
                ArrayList userInfo = new ArrayList();

                if (String.IsNullOrEmpty(textBox_name.Text) || String.IsNullOrEmpty(textBox_age.Text) ||
                    String.IsNullOrEmpty(textBox_dept.Text) || String.IsNullOrEmpty(textBox_qual.Text) ||
                    String.IsNullOrEmpty(textBox_exp.Text) || String.IsNullOrEmpty(textBox_salary.Text) ||
                    String.IsNullOrEmpty(textBox_phone.Text) || String.IsNullOrEmpty(richTextBox_address.Text))
                {
                    MessageBox.Show("Fill up all data");
                }

                else
                {
                    userInfo.Add(textBox_id.Text);
                    userInfo.Add(textBox_name.Text);
                    userInfo.Add(textBox_age.Text);
                    userInfo.Add(comboBox_gender.Text);
                    userInfo.Add(textBox_dept.Text);
                    userInfo.Add(textBox_qual.Text);
                    userInfo.Add(textBox_exp.Text);
                    userInfo.Add(textBox_salary.Text);
                    userInfo.Add(textBox_phone.Text);
                    userInfo.Add(richTextBox_address.Text);

                    DatabaseHelperClass ob = new DatabaseHelperClass(userInfo);
                    if (ob.addNewEmployee(employee))
                    {
                        MessageBox.Show("Stuff Added");
                    }
                    else
                    {
                        MessageBox.Show("Error Adding Stuff");
                    }
                }
            }


            else
            {
                MessageBox.Show("Error");
            }
        }