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 CheckboxDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string youchose = "";
            //Control控件
            for (int i = 0; i < this.groupBox1.Controls.Count; i++)
            {
                if (this.groupBox1.Controls[i] is CheckBox)
                {
                    CheckBox ck = (CheckBox)this.groupBox1.Controls[i];
                    if (ck.Checked)
                    {
                        youchose += " " + ck.Text;
                    }
                }
            }
            MessageBox.Show(youchose);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string youchose = "";
            if (checkBox5.Checked)
            {
                youchose += checkBox5.Text;
            }
            if (checkBox6.Checked)
            {
                youchose += checkBox6.Text;
            }
            if (checkBox7.Checked)
            {
                youchose += checkBox7.Text;
            }
            if (checkBox8.Checked)
            {
                youchose += checkBox8.Text;
            }
            MessageBox.Show(youchose);
        }
    }
}