asp.net上传下载,自我测试

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;

namespace sz
{
 /// <summary>
 /// upfile 的摘要说明。
 /// </summary>
 public class upf : System.Web.UI.Page
 {
  protected System.Web.UI.HtmlControls.HtmlInputFile upf1;
  private void Page_Load(object sender, System.EventArgs e)
  {
   

  }
  public void submit_click(object sender,System.EventArgs e)
  {
   if(upf1.PostedFile.ContentLength>0)
   { 
    string[] FileSplite = upf1.PostedFile.FileName.Split('//');//取得文件名称
    string fn = FileSplite[FileSplite.Length -1];
    string ft = upf1.PostedFile.ContentType;
    FileInfo fi=new FileInfo(upf1.PostedFile.FileName);
    FileStream fs=fi.OpenRead();
    byte[] bytes=new byte[fs.Length];
    fs.Read(bytes,0,Convert.ToInt32(fs.Length));
    string conn = ConfigurationSettings.AppSettings["myConn9"];
    SqlConnection cn = new SqlConnection(conn);
    SqlCommand cm=new SqlCommand();
    cm.Connection=cn;
    cm.CommandType=CommandType.Text;
    if(cn.State==0) cn.Open();
    cm.CommandText="insert into sz_file (filename,filetype,filedata) values ('"+fn+"','"+ft+"',@file)";
    SqlParameter spFile=new SqlParameter("@file",SqlDbType.Image);
    spFile.Value=bytes;
    cm.Parameters.Add(spFile);
    cm.ExecuteNonQuery();
   }
  }
  public void down_click(object sender,System.EventArgs e){
   string conn = ConfigurationSettings.AppSettings["myConn9"];
   string StrSql = "select * from sz_file";
   SqlConnection MyConnection = new SqlConnection(conn);
   SqlCommand MyCommand = new SqlCommand();
   MyCommand.Connection = MyConnection;
   SqlDataAdapter objDataAdapter = new SqlDataAdapter();
   objDataAdapter.SelectCommand = MyCommand;
   DataSet objectSet = new DataSet();
   MyCommand.CommandText = StrSql;
   objDataAdapter.Fill(objectSet,"a");
   DataRow dr=objectSet.Tables["a"].Rows[0];
   byte[] File=null;
   File=(byte[])dr["filedata"];
   Response.AddHeader("Content-Disposition", "attachment;filename="+HttpUtility.UrlEncode(dr["filename"].ToString(),System.Text.Encoding.UTF8));
   Response.ContentType=dr["filetype"].ToString();
   Response.BinaryWrite(File);
  }
  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <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()
  {   
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
 }
}