form1.cs

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

namespace task
{
    public partial class Form1 : Form
    {
        Form2 f1 = new Form2();
        Form3 f2 = new Form3();
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            f1.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            f2.Show();
        }

        private void menuItem1_Click(object sender, EventArgs e)
        {

        }

        private void menuItem2_Click(object sender, EventArgs e)
        {
            f1.Show();
        }

        private void menuItem3_Click(object sender, EventArgs e)
        {
            f2.Show();
        }
    }
}