Student Registration Form First Form

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace StudentRegistrationApplication
{
    public partial class frmStudentRegistration : Form
    {
        public frmStudentRegistration()
        {

            InitializeComponent();
            for (int day = 1; day <= 31; day++)
            {
                ComboBoxDay.Items.Add(day);
            }
            for (int month = 1; month <= 12; month++)
            {
                ComboBoxMonth.Items.Add(month);
            }
            for (int year = 1900; year <= 2021; year++)
            {
                ComboBoxYear.Items.Add(year);
            }

        }


    private void BtnRegisterStudent_Click(object sender, EventArgs e)
        {
            String LastName = TxtboxLastName.Text;
            String StudentName = TxtboxFirstName.Text;
            String MiddleName = TxtboxMiddleName.Text;

            RadioButtonMale.Checked = true;
            RadioButtonFemale.Checked = true;
            this.Hide();
            frmStudentRegistration2 fsr2 = new frmStudentRegistration2();
            fsr2.ShowDialog();

        }



    }
}