哪位大师知道ASP.NET好的FTP下传控件

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Threading;using System.IO;using System.Net;using System.Net.Security;public partial class FTPUpload : System.Web.UI.Page{    private NetworkCredential certificate;    private FtpBLL.FTPGlobalVar FTPVar;    protected void Page_Load(object sender, EventArgs e)    {        FTPVar = FtpBLL.staticFTPGlobalVar.FTPVar;        if (FTPVar != null)        {            UploadFile(FTPVar.Target, FTPVar.user, FTPVar.password, FTPVar.buffer);            FtpBLL.staticFTPGlobalVar.FTPVar = null;            GC.Collect();        }    }    private bool UploadFile(string target, string userName, string password, byte[] buffer)    {        bool bReturn = false;        // 根据 ProgressBar.htm 显示进度条界面        string templateFileName = Path.Combine(Server.MapPath("."), "ProgressBar.htm");        StreamReader reader = new StreamReader(@templateFileName, System.Text.Encoding.GetEncoding("gb2312"));        string html = reader.ReadToEnd();        reader.Close();        Response.Write(html);        Response.Flush();        certificate = new NetworkCredential(userName, password);        int fsLength = buffer.Length;        MemoryStream sourceStreamT = new MemoryStream(buffer);                Stream sourceStream = sourceStreamT;        string message = GetFileNames(target);        int x = 250000;        int filemax = 0;        if (message != "")        {            filemax = int.Parse(message.Substring(message.IndexOf(" ") + 1).Substring(0, message.Substring(message.IndexOf(" ") + 1).Length - 2));        }        if (filemax == fsLength)        {            string jsBlock = "<script>ShowMsg('该文件已完成上传。');</script>";            Response.Write(jsBlock);            Response.Flush();            return true;        }        if (filemax != 0)        {            UploadFile(sourceStream, new Uri(target), filemax, WebRequestMethods.Ftp.UploadFile);        }        else        {            UploadFile(sourceStream, new Uri(target), 0, WebRequestMethods.Ftp.UploadFile);        }        return bReturn;    }    #region Internal Members    #endregion    /// <summary>    /// 创建FTP请求    /// </summary>    private FtpWebRequest CreateFtpWebRequest(Uri uri, string method)    {        FtpWebRequest ftpClientRequest = (FtpWebRequest)WebRequest.Create(uri);        ftpClientRequest.KeepAlive = false;        ftpClientRequest.Proxy = null;        ftpClientRequest.Credentials = certificate;        ftpClientRequest.KeepAlive = true;        ftpClientRequest.UseBinary = true;        ftpClientRequest.UsePassive = true;        ftpClientRequest.Method = method;        //ftpClientRequest.Timeout = 60;        return ftpClientRequest;    }    #region 支持断点续传    public bool UploadFile(Stream sourceStream, Uri destinationPath, int offSet, string ftpMethod)    {        try        {            FtpWebRequest request = CreateFtpWebRequest(destinationPath, ftpMethod);            request.ContentOffset = offSet;            Stream requestStream = null;            try            {                requestStream = request.GetRequestStream();//需要获取文件的流            }            catch(Exception ex)            {                string jsBlock = "<script>alert('" + ex.Message + "');</script>";                Response.Write(jsBlock);                Response.Flush();                return false;            }            int sourceLength = int.Parse(sourceStream.Length.ToString());            offSet = CopyDataToDestination(sourceStream, requestStream, offSet);            WebResponse response = request.GetResponse();            response.Close();        }        catch (Exception ex)        {                        ex.ToString();            return false;        }        return true;    }    public string GetFileNames(string URI)    {        WebClient wClient = new WebClient();        FtpWebRequest FtpClient;        Uri uri = new Uri(URI);        FtpClient = CreateFtpWebRequest(uri, WebRequestMethods.Ftp.GetFileSize);        try        {            FtpWebResponse response = (FtpWebResponse)FtpClient.GetResponse();            return response.StatusDescription;        }        catch (Exception ex)        {                       return "";        }    }    private int CopyDataToDestination(Stream sourceStream, Stream destinationStream, int offSet)    {        try        {            int sourceLength = (int)sourceStream.Length;            sourceStream.Seek(offSet, SeekOrigin.Current);            string jsBlock;            int bytesRead = 0;            int iSpan = 1024 * 1024;//一次传1M            if (sourceLength - offSet < iSpan)                iSpan = sourceLength - offSet;            byte[] buffer = new byte[iSpan];            bytesRead = sourceStream.Read(buffer, 0, iSpan);            while (bytesRead != 0)            {                destinationStream.Write(buffer, 0, iSpan);                offSet += iSpan;                if (sourceLength - offSet < iSpan)                    iSpan = sourceLength - offSet;                bytesRead = sourceStream.Read(buffer, 0, iSpan);                int i = (int)((double)offSet / (double)sourceLength * 100f);                jsBlock = "<script>SetPorgressBar('" + "A" + i.ToString() + "','" + i.ToString() + "');</script>";                Response.Write(jsBlock);                Response.Flush();            }            offSet = 0;        }        catch (Exception ex)        {            string jsBlock = "<script>alert('" + ex.Message + "');</script>";            Response.Write(jsBlock);            Response.Flush();            string error = ex.ToString();            return offSet;        }        finally        {            sourceStream.Close();            destinationStream.Close();        }        return offSet;    }    #endregion}