C# 异型窗口，圆形窗口

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }
        // 下载于www.51aspx.com
        private void button1_Click（object sender EventArgs e）
        {
            Form2 fr = new Form2（）;
            fr.Show（）;
        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件        2562  2014-10-24 08:59  51Aspx源码必读.txt
     文件        2039  2014-10-01 17:14  Form1.Designer.cs
     文件         557  2014-10-24 08:56  Form1.cs
     文件        5817  2014-10-01 17:14  Form1.resx
     文件        3776  2014-10-01 21:30  Form2.Designer.cs
     文件        1862  2014-10-24 08:56  Form2.cs
     文件      166941  2014-10-01 21:30  Form2.resx
     文件         531  2014-10-24 08:56  Program.cs
     目录           0  2014-10-24 08:48  Properties\
     文件        1406  2014-10-24 08:56  Properties\AssemblyInfo.cs
     文件        2900  2014-10-01 17:04  Properties\Resources.Designer.cs
     文件        5612  2014-10-01 17:04  Properties\Resources.resx
     文件        1111  2014-10-01 17:04  Properties\Settings.Designer.cs
     文件         249  2014-10-01 17:04  Properties\Settings.settings
     文件        4011  2014-10-01 19:46  WindowsFormsApplication1.csproj
     文件         143  2014-10-01 19:46  WindowsFormsApplication1.csproj.user
     文件         889  2014-10-24 08:57  WindowsFormsApplication1.sln
     文件       28672  2014-10-24 08:59  WindowsFormsApplication1.suo
     目录           0  2014-10-01 19:46  bin\
     目录           0  2014-10-24 08:48  bin\Debug\
     文件      117760  2014-10-01 21:30  bin\Debug\WindowsFormsApplication1.exe
     文件       30208  2014-10-01 21:30  bin\Debug\WindowsFormsApplication1.pdb
     文件       11600  2014-10-24 08:56  bin\Debug\WindowsFormsApplication1.vshost.exe
     文件         490  2012-06-02 22:34  bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
     目录           0  2014-10-24 09:00  bin\Release\
     文件        4945  2014-04-30 09:10  from.gif
     目录           0  2014-10-01 19:46  obj\
     目录           0  2014-10-01 19:46  obj\x86\
     目录           0  2014-10-24 08:48  obj\x86\Debug\
     文件        5359  2014-10-01 21:27  obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6480  2014-10-24 08:50  obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
............此处省略11个文件信息