Form13.cs

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 FlightReservation
{
    public partial class Form13 : Form
    {
        public Form13()
        {
            InitializeComponent();
            button1.Click += button1_Click;
            button2.Click += button2_Click;
            button3.Click += button3_Click;
            button4.Click += button4_Click;
            button5.Click += button5_Click;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form1 form1 = new Form1();
            form1.Show();
            this.Hide();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            Form6 form6 = new Form6();
            form6.Show();
            this.Hide();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            Form11 form11 = new Form11();
            form11.Show();
            this.Hide();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            Form9 form9 = new Form9();
            form9.Show();
            this.Hide();
        }

        private void button5_Click(object sender, EventArgs e)
        {
            Form10 form10 = new Form10();
            form10.Show();
            this.Hide();
        }
    }
}