在传值时,出现一个错误...

不知道哪里错...请帮个忙..在前台..数据库是accessDefault.aspx
<%@ Page Language="C#"  Debug="true" MasterPageFile="~/show.master" AutoEventWireup="true" CodeFile="default.aspx.cs" Inherits="_default" Title="文件展示" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<table cellpadding="0" cellspacing="0">
<tr>
<td>
        <div style="width:285px;">
            <div style="width:285px; background-image:url(images/sk2.jpg); height:27px; line-height:27px; font-size:13px; font-weight:bold; color:White;">
            <div style="float:left">最新上传软件</div>
            <div style="float:right"><a href=typeIndex.aspx?act=new style="color:">【更多更新】</a></div>
            </div>
            <div style="border:1px #feb301 solid; width:283px; margin-top:5px;">
                    <asp:DataList ID="new_soft" runat="server">
                    <ItemTemplate>&nbsp&nbsp[<%# soft_type_name(DataBinder.Eval(Container.DataItem,"classid").ToString()) %>]&nbsp
                    <a href=downfile.aspx?downId=<%# DataBinder.Eval(Container.DataItem,"Id") %>>
                    <%# Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName")).Length > 14 ? Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName")).Substring(0, 14)+".." : Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName"))%>
                    </a>
                    </ItemTemplate>
                    </asp:DataList>
                    &nbsp;&nbsp;<asp:Label ID="isgood_info" runat="server"></asp:Label>
            </div>
        </div>
<td>
        <div style="width:285px; margin-left:5px;">
            <div style="width:285px; background-image:url(images/sk2.jpg); height:27px; line-height:27px; font-size:13px; font-weight:bold; color:White;">
            <div style="float:left">下载排行榜</div>
            <div style="float:right"><a href=typeIndex.aspx?act=hot style="color:">【更多排行】</a></div>
            </div>
            <div style="border:1px #feb301 solid; width:283px; margin-top:5px;">
                <div>
                    <asp:DataList ID="hits_soft" runat="server">
                    <ItemTemplate>&nbsp&nbsp[<%# soft_type_name(DataBinder.Eval(Container.DataItem,"classid").ToString()) %>]&nbsp
                    <a href=downfile.aspx?downId=<%# DataBinder.Eval(Container.DataItem,"Id") %>>
                    <%# Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName")).Length > 14 ? Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName")).Substring(0, 14)+".." : Convert.ToString(DataBinder.Eval(Container.DataItem, "fileName"))%>
                    </a>
                    </ItemTemplate>
                    </asp:DataList>
                    &nbsp;&nbsp;<asp:Label ID="Label1" runat="server"></asp:Label></div>
            </div>
        </div></td>
<td></td>
</tr></table>
        
        
</asp:Content>Default.aspx.csusing System;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
using System.Collections;
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.Data.SqlClient;public partial class _default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.new_softList();//最新上传软件
        this.hist_softList();//下载排行榜
    }    protected void new_softList()
    {
        DataView dv = dTable("select top 27 * from fileMain order by Id desc", "fileMain");
        this.new_soft.DataSource = dv;
        this.new_soft.DataBind();
    
    }
    protected void hist_softList()
    {
        DataView dv2 = dTable("select top 27 * from fileMain order by downHits desc", "fileMain");
        this.hits_soft.DataSource = dv2;
        this.hits_soft.DataBind();
    
    
    }
    private DataView dTable(string query, string table)
    {
        OleDbConnection conn = publicCS.ceconn();
        OleDbDataAdapter sda = new OleDbDataAdapter(query, conn);
        DataSet ds = new DataSet();
        sda.Fill(ds, table);
        return ds.Tables[table].DefaultView;
    }
    protected string soft_type_name(string classid)
    {
        DataView dv3 = dTable("select * from fileType where id=" + classid + "","fileType");
        if (dv3.Table.Rows.Count != 0)
        {
            return dv3.Table.Rows[0]["tName"].ToString();
        }
        else
        {
            return "0";
        }
    
    
    }}有兴趣探讨的请加QQ..注明asp.net