asp.net(c#)从url网络地址下载图片或文件到本地硬盘

using System;
using System.Net;
using System.IO;

namespace Com.Net
{
/// <summary>
/// Image 的摘要说明。
/// </summary>
public class Image
{
   public Image()
   {
    //
    // TODO: 在此处添加构造函数逻辑
    //
   }
   /// <summary>
   /// 从图片地址下载图片到本地磁盘
   /// </summary>
   /// <param name="ToLocalPath">图片本地磁盘地址</param>
   /// <param name="Url">图片网址</param>
   /// <returns></returns>
   public static bool SavePhotoFromUrl(string FileName,string Url)
   {
    bool Value=false;
    WebResponse response = null;
    Stream stream = null;

    try
    {
     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
       
     response = request.GetResponse();
     stream = response.GetResponseStream();

     if( !response.ContentType.ToLower().StartsWith("text/") )
     {
      value="/Image.SaveBinaryFile(response,FileName);
     }

    }
    catch(Exception" err)
    {
     string aa=err.ToString();
    }
    return Value;
   }
   /// <summary>
   /// Save a binary file to disk.
   /// </summary>
   /// <param name="response">The response used to save the file</param>
   // 将二进制文件保存到磁盘
   private static bool SaveBinaryFile(WebResponse response,string FileName)
   {
    bool Value=true;
    byte []buffer = new byte[1024];

    try
    {
     if(Com.File.FileUtil.FileExists(FileName))
      Com.File.FileUtil.DeleteFile(FileName);
     Stream outStream =System.IO.File.Create( FileName );
     Stream inStream = response.GetResponseStream();
   
     int l;
     do
     {
      l = inStream.Read(buffer,0,buffer.Length);
      if(l>0)
       outStream.Write(buffer,0,l);
     }
     while(l>0);
   
     outStream.Close();
     inStream.Close();
    }
    catch
    {
     Value=false;
    }
    return Value;
   }
}
}