C#(winform)项目中自制alert提示窗体并引用系统图标资源

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;
using System.Reflection;


namespace FB.FormHelper
{
    public partial class CloseForm : Form
    {
        /// <summary>
        /// 构造函数
        /// </summary>
        public CloseForm()
        {
            InitializeComponent();
            this.DialogResult = DialogResult.Cancel;
        }
        /// <summary>
        /// 确定按钮点击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            if (radioButton1.Checked)
            {
                this.DialogResult = DialogResult.OK;                
            }
            else
            {
                this.DialogResult = DialogResult.No;
            }
            this.Close();
        }
        /// <summary>
        /// 绘图事件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {            
            Graphics g = e.Graphics;
            Icon icon = SystemIcons.Question;
            g.DrawIcon(icon, 30, 16);
        }
        /// <summary>
        /// 取消按钮点击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

    }
}