<FORM id="form1" runat="server">
            <DIV id="div1">
                <INPUT ID="File1" TYPE="file" NAME="File1" runat="server">
                <INPUT TYPE="button" VALUE="添加附件" onclick="javascript:AddFile();">
                <INPUT TYPE="button" VALUE="删除附件" onclick="javascript:RemoveFile();">
                <ASP:LISTBOX id="ListBox1" Width="200px" Height="100px" runat="server"></ASP:LISTBOX>
                <ASP:BUTTON id="Button1" runat="server" Text="保存" Width="60px"></ASP:BUTTON>
            </DIV>
            <ASP:LITERAL ID="lResult" Runat="server"></ASP:LITERAL>
             
        </FORM>

<SCRIPT language="javascript">
<!--
 function AddFile()
 {    
  
    var file = document.getElementById("div1").firstChild;
    if(file.value == "")
    {
        alert("请选择文件!");
        return;
    }
    var o = new Option();
    var ary = file.value.split("\");
    var filename = ary[ary.length-1];
    
    if(CheckOptionsExists(filename,document.getElementById("ListBox1")))
    {
        alert("文件已经存在列表中!");
        return;
    }
    
    
    var f = document.createElement("input");
    f.type = "file";
    f.name = "file"
    div1.insertBefore(f,div1.firstChild);
    
    
    o.innerText = filename;
    o.value = f.uniqueID;
     
    document.getElementById("ListBox1").appendChild(o);
    
    file.style.display = "none";
    
     
    
 }
 
 function RemoveFile()
 {
    var lst = document.getElementById("ListBox1");
    if(lst.selectedIndex == -1)
    {
        alert("请选择要删除的附件!");
        return;
    }
    
    var id = lst.value;
    div1.removeChild(document.all[id]);
    lst.removeChild(lst.options[lst.selectedIndex]);
 }
 
 //检查选项是否存在.
 function CheckOptionsExists(value,ddl)
 {
    for(var i=0;i<ddl.options.length;i++)
    {
        if(ddl.options[i].innerText == value)
        {
            return true;
        }
    }
    return false;
 }
//-->
        </SCRIPT>

private void Button1_Click(object sender, System.EventArgs e)
        {
             
            for(int i=0;i<Request.Files.Count;i++)
            {
                if(Request.Files[i].ContentLength >0)
                {
                    string filename = System.IO.Path.GetFileName(Request.Files[i].FileName);
                    Request.Files[i].SaveAs(Server.MapPath(filename));
                    this.ListBox1.Items.Add(new ListItem(filename,filename));
                }

this.lResult.Text = "保存成功!";
            }
            
        }