如何获取C#网页源代码？

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Text;
using System.IO;

namespace Banyiweb
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBoxWeb;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.StatusBar statusBar1;
private System.Windows.Forms.RichTextBox richTextBox1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TOD 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.label1 = new System.Windows.Forms.Label();
this.textBoxWeb = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.statusBar1 = new System.Windows.Forms.StatusBar();
this.richTextBox1 = new System.Windows.Forms.RichTextBox();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(0, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(72, 16);
this.label1.TabIndex = 0;
this.label1.Text = "请输入网址:";
//
// textBoxWeb
//
this.textBoxWeb.Location = new System.Drawing.Point(80, 8);
this.textBoxWeb.Name = "textBoxWeb";
this.textBoxWeb.Size = new System.Drawing.Size(248, 21);
this.textBoxWeb.TabIndex = 1;
this.textBoxWeb.Text = "http://www.";
//
// button1
//
this.button1.Location = new System.Drawing.Point(344, 8);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(56, 20);
this.button1.TabIndex = 2;
this.button1.Text = "提交";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// statusBar1
//
this.statusBar1.Location = new System.Drawing.Point(0, 351);
this.statusBar1.Name = "statusBar1";
this.statusBar1.Size = new System.Drawing.Size(416, 22);
this.statusBar1.TabIndex = 5;
this.statusBar1.Text = "http://www.banyi.com/txxlby: Banyi";
//
// richTextBox1
//
this.richTextBox1.Location = new System.Drawing.Point(0, 32);
this.richTextBox1.Name = "richTextBox1";
this.richTextBox1.Size = new System.Drawing.Size(416, 320);
this.richTextBox1.TabIndex = 6;
this.richTextBox1.Text = "请正确输入网址，在程序找不到网址的时候会变慢";
//
// Form1
//
this.AutoScale = false;
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(416, 373);
this.Controls.Add(this.richTextBox1);
this.Controls.Add(this.statusBar1);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBoxWeb);
this.Controls.Add(this.label1);
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.Name = "Form1";
this.Text = "网页源代码";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e)
{
string webstr;
webstr=textBoxWeb.Text;
if (webstr.IndexOf("http:") <0)
{
MessageBox.Show("出错了BANYI","你输入的网址有误");
textBoxWeb.Text="http://www.";
return;
}
button1.Enabled=false;
HttpWebResponse res;
HttpWebRequest req;
try
{ req=(HttpWebRequest)WebRequest.Create(webstr);
res=(HttpWebResponse)req.GetResponse();
}
catch (Exception)
{
MessageBox.Show("出错了BANYI","对不起找不到该网址");
button1.Enabled=true;
return;
}
textBoxWeb.Text="正在读取中....";
StreamReader strm=new StreamReader(res.GetResponseStream(),Encoding.GetEncoding(54936));//简体中文Encoding.GetEncoding(54936),Encoding.ASCII
String sLine;
richTextBox1.Text="";

do//学习笔记do循环C# do while 循环体 loopdo until 循环体 loop
{
sLine=strm.ReadLine();
richTextBox1.Text=richTextBox1.Text+sLine;
}
while (sLine!=null);
strm.Close();
textBoxWeb.Text="http://www.";
button1.Enabled=true;

}

}
}
这边就是改了一个编码的问题。这样才可以获得中文Encoding.GetEncoding(54936)

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