CheckBox和richTextBox

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            foreach (Control ctl in this.Controls)//遍历窗体中的控件
            {
                if(ctl.GetType().Name =="CheckBox")//判断控件的类型是否是CheckBox
                {CheckBox cbox=(CheckBox)ctl;//将遍历的控件强制转换
                cbox.AutoEllipsis = true;//设置文本过长显示...                //cbox.CheckAlign = ContentAlignment.MiddleCenter;千万不敢写这个选项，不然运行结果如下图                 

                 cbox.CheckAlign = ContentAlignment.BottomRight;
                 cbox.Checked=false;
                }
            }
        }
        //选择篮球复选框
        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)//判断checkBox1是否选中
            {
                if (richTextBox1.Text == "")
                    richTextBox1.Text = checkBox1.Text;//为文本框赋值
                else
                    richTextBox1.Text +="," +checkBox1.Text;

            }

        }
        //选择足球复选框
        private void checkBox2_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox2.Checked)//判断checkBox2是否选中
            {
                if (richTextBox1.Text == "")
                    richTextBox1.Text = checkBox2.Text;//为文本框赋值
                else
                    richTextBox1.Text += "," + checkBox2.Text;

            }

        }
        //选择兵乓球复选框
        private void checkBox3_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox3.Checked)//判断checkBox3是否选中
            {
                if (richTextBox1.Text == "")
                    richTextBox1.Text = checkBox3.Text;//为文本框赋值
                else
                    richTextBox1.Text += "," + checkBox3.Text;

            }

        }

    }
}