Form1.cs

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

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public Form2 f2 = null;
        public Form3 f3 = null;

        private void ShowForm(Form form)
        {
            form.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            form.MdiParent = this;
            form.Dock = DockStyle.Fill;
            TopMost = false;
            this.panel2.Controls.Add(form);//将子窗体载入panel
            form.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.panel2.Controls.Clear();
            f2 = new Form2();
            ShowForm(f2);
        }
        private void button3_Click(object sender, EventArgs e)
        {
            this.panel2.Controls.Clear();
            f3 = new Form3();
            ShowForm(f3);
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.panel2.Controls.Clear();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            this.panel2.Controls.Clear();
            f2 = new Form2();
            f3 = new Form3();
            f2.FormBorderStyle = f3.FormBorderStyle= System.Windows.Forms.FormBorderStyle.FixedSingle;
            f2.MdiParent = f3.MdiParent = this;
            this.panel2.Controls.Add(f2);//将子窗体载入panel
            this.panel2.Controls.Add(f3);//将子窗体载入panel
            f2.Show();
            f3.Show();


        }