ASP.NET多文件上传方案

Code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)//首次执行页面
        {
            SFUPC();//页面执行一次将上传文件控件集到缓存中
        }
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        UpFile();//执行上传文件
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        InsertC();//执行添加控件方法
    }
    private void SFUPC()//该方法用于保存当前页面上传文件控件集到缓存中
    {
        ArrayList AL = new ArrayList();//创建动态增加数组
        foreach (Control C in F.Controls)
        {
            if (C.GetType().ToString() == "System.Web.UI.HtmlControls.HtmlTableRow")
            {
                HtmlTableCell HTC = (HtmlTableCell)C.Controls[0];
                foreach (Control FUC in HTC.Controls)
                {
                    if (FUC.GetType().ToString() == "System.Web.UI.WebControls.FileUpload")
                    {
                        FileUpload FU = (FileUpload)FUC;
                        AL.Add(FU);
                    }
                }
            }
        }
        Session.Add("FilesControls", AL);
    }
    private void InsertC()//该方法用于添加一个上传文件的控件
    {
        ArrayList AL = new ArrayList();
        this.F.Rows.Clear();
        GetInfo();
        HtmlTableRow HTR = new HtmlTableRow();
        HtmlTableCell HTC = new HtmlTableCell();
        HTC.Controls.Add(new FileUpload());
        HTR.Controls.Add(HTC);
        F.Rows.Add(HTR);
        SFUPC();
    }
    private void GetInfo()//该方法用于读取缓存中存储的上传文件控件集
    {
        ArrayList AL = new ArrayList();
        if (Session["FilesControls"] != null)
        {
            AL = (System.Collections.ArrayList)Session["FilesControls"];
            for (int i = 0; i < AL.Count; i++)
            {
                HtmlTableRow HTR = new HtmlTableRow();
                HtmlTableCell HTC = new HtmlTableCell();
                HTC.Controls.Add((System.Web.UI.WebControls.FileUpload)AL[i]);
                HTR.Controls.Add(HTC);
                F.Rows.Add(HTR);
            }
        }
    }
    private void UpFile()//该方法用于执行文件上传操作
    {
       
        if (FileUpload1.PostedFile.FileName == "")
            {
                Response.Write("<script language=javascript>alert('上传文件不能为空！')</script>");
                return;
            }
            else
            {
                string FilePath = Server.MapPath("./") + "Files";
                HttpFileCollection HFC = Request.Files;
                for (int i = 0; i < HFC.Count; i++)
                {
                    HttpPostedFile UserHPF = HFC[i];
                    try
                    {
                        if (UserHPF.ContentLength > 0)
                        {
                            UserHPF.SaveAs(FilePath + "\\" + System.IO.Path.GetFileName(UserHPF.FileName));
                            SqlConnection con = new SqlConnection("server=(local);user id=sa;pwd=;Database=mrdb");
                            con.Open();
                            string str = "select count(*) from tb_files where name='" + System.IO.Path.GetFileName(UserHPF.FileName) + "'";
                            SqlCommand mycom = new SqlCommand(str, con);
                            int intcont = Convert.ToInt32(mycom.ExecuteScalar());
                            if (intcont > 0)
                            {
                                Response.Write("<script language=javascript>alert('对不起!不允许上传相同记录！')</script>");
                                return;
                            }
                            else
                            {
                                SqlCommand com = new SqlCommand("INSERT INTO tb_files(name,fileload)values('" + System.IO.Path.GetFileName(UserHPF.FileName) + "','" + FilePath + "')", con);
                                com.ExecuteNonQuery();
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        Response.Write(ex.Message.ToString());
                    }
                }
            }
            if (Session["FilesControls"] != null)
            {
                Session.Remove("FilesControls");
            }
            Response.Write("<script language=javascript>alert('上传成功！');location='InFo.aspx'</script>");
        }
    protected void Button3_Click(object sender, EventArgs e)
    {
        Response.Redirect("InFo.aspx");
    }
}