SharePoint上传文件显示在label 页面Session["demo"] = new List<String>();（实现）

前台代码

 <div>
    <asp:Button ID="Button2" runat="server"   OnClick="Button2_Click" Text="添加" />
    <asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Panel ID="Panel1" runat="server" ViewStateMode="Enabled"></asp:Panel>
    <asp:HiddenField ID="HiddenField1" runat="server" />
        <br />
        个数<br />
        <asp:Label ID="Label3" runat="server"></asp:Label>
        <br />
      <p id="p1" runat="server"><%=f%></p>
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />
        <br />获取的数值只要是传给label都可以正常显示<br />
        <asp:Label ID="Label2" runat="server"></asp:Label>
        </div>

后台

  protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Session["demo"] = new List<String>();
        }
    }
    public static string f;
    protected void Button2_Click(object sender, EventArgs e)
    {
        string file_KB = FileUpload1.PostedFile.ContentLength.ToString() + "KB<br>";//获取文件大小
        string file = FileUpload1.FileName;//获取上传文件名字

        string URL = "http://amid01110/456/" + file + " ";


        List<string> list = Session["demo"] as List<string>;
        Session["demo"] = list;
        string lntext = "<a  href='" + URL + "'  >" + file + "</a>" + "大小" + file_KB + "上传文件成功";

        list.Add(lntext);
       
        foreach (string item in list)
        {
            f = item;
            //p1.InnerHtml = item;
            Response.Write(item);
            string a = item;
            string b = Session["demo"].ToString();
        }
        int max = list.Count;

        Label2.Text = max.ToString();

        Label3.Text = list.Count.ToString();
    }