05

namespace StudentRegistrationApplication
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            d_cbox.Items.AddRange(Enumerable.Range(1, 31).Select(i => (object)i).ToArray());
            m_cbox.Items.AddRange(Enumerable.Range(1, 12).Select(i => (object)i).ToArray());
            for (int x = 1900; x < 2021; x++)
            {
                y_cbox.Items.Add(x);
            }
        }

        private void reg_btn_Click(object sender, EventArgs e)
        {
            if (validateName())
            {
                String gender = "";
                if (m_rdbtn.Checked) gender = "Male";
                else gender = "Female";
                if (d_cbox.SelectedItem == null || m_cbox.SelectedItem == null || y_cbox.SelectedItem == null)
                {
                    MessageBox.Show("Date of birth can't be empty.", "error");
                }
                else
                {
                    if (gender != "")
                    {
                        MessageBox.Show("Student Name: " + lname_tbox.Text + ", " + fname_tbox.Text + " " +
                            mname_tbox.Text + "\nGender: " + gender + "\nDate of Birth: " + d_cbox.SelectedItem + "/" +
                            m_cbox.SelectedItem + "/" + y_cbox.SelectedItem);
                    }
                    else
                    {
                        MessageBox.Show("Please pick a Gender", "error");
                    }
                }
            }
        }
        Boolean validateName()
        {
            if (String.IsNullOrEmpty(fname_tbox.Text) || String.IsNullOrEmpty(lname_tbox.Text))
            {
                MessageBox.Show("First name and Last name can't be empty.", "error_name_values");
                return false;
            }
            else
            {
                if (!System.Text.RegularExpressions.Regex.IsMatch(fname_tbox.Text, "^[a-zA-Z ]*$") ||
                    !System.Text.RegularExpressions.Regex.IsMatch(lname_tbox.Text, "^[a-zA-Z ]*$") ||
                    !System.Text.RegularExpressions.Regex.IsMatch(mname_tbox.Text, "^[a-zA-Z ]*$"))
                {
                    MessageBox.Show("You may only enter letters in your name", "error_name_values");
                    return false;
                }
                else
                {
                    return true;
                }
            }
        }
    }
}