是這樣的，我今天需要一個小功能，是把檔案上傳至sqlserver裡，
我後來有找到參考網站，我是參考這個
http://www.dotnetawesome.com/2013/11/how-to-upload-and-download-files-tofrom.html
只是為什麼我打完後，用chrome開啟，無法上傳，網頁直接顯示localhost 拒絕連線。
但用edge就可以上傳，但也只能上傳一個，若上傳一個以上他就會顯示這種錯誤

以下是我的程式碼
前端:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication3._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
    <h3>File Upload / Download from/to Database using ASP.NET</h3>
    <div>
        <table>
            <tr>
               <td>select File:</td>
                <td>
                    <asp:FileUpload ID="FileUpload1" runat="server" /></td>
                <td>
                    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click1" /></td>
            </tr>
        </table>
        <br />
        <div>
            <asp:DataList ID="DataList1" runat="server" RepeatColumns="4" RepeatDirection="Horizontal">
                <ItemTemplate>
                    <table>
                        <tr>
                            <td><%#Eval("FileName","File Name:{0}") %></td>
                        </tr>
                        <tr>
                            <td><%# Convert.ToDecimal(Eval("Filesize"))/1024%> KB</td>
                        </tr>
                        <tr>
                            <td>
                                <asp:LinkButton ID="lbtnDownload" runat="server" CommandName="Download" CommandArgument=<%# Eval("FileID") %>>Download</asp:LinkButton></td>
                        </tr>
                    </table>
                </ItemTemplate>
            </asp:DataList>
        </div>
    </div>

</asp:Content>

後端部分:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication3
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                PopulateUploadedFiles();
            }
        }

        private void PopulateUploadedFiles()
        {
            using (UpLoadDatabase1Entities uc = new UpLoadDatabase1Entities())
            {
                List<UploadedFile> allFiles = uc.UploadedFiles.ToList();
                DataList1.DataSource = allFiles;
                DataList1.DataBind();
            }
        }

        protected void btnUpload_Click1(object sender, EventArgs e)
        {
            if (FileUpload1.HasFile)
            {
                HttpPostedFile file = FileUpload1.PostedFile;
                BinaryReader br = new BinaryReader(file.InputStream);
                byte[] buffer = br.ReadBytes(file.ContentLength);

                using (UpLoadDatabase1Entities uc = new UpLoadDatabase1Entities())
                {
                    uc.UploadedFiles.Add(
                        new UploadedFile
                        {
                            FileName =file.FileName,
                            ContentType=file.ContentType,
                            FileID=0,
                            FileSize=file.ContentLength,
                            FileExtension=Path.GetExtension(file.FileName),
                            FileContent = buffer
                        });
                    uc.SaveChanges();
                    PopulateUploadedFiles();
                }
            }
        }
    }
}

資料庫:

CREATE TABLE [dbo].[UploadedFile] (
    [FileID]        INT             NOT NULL,
    [FileName]      VARCHAR (200)   NOT NULL,
    [FileSize]      INT             NOT NULL,
    [ContentType]   VARCHAR (200)   NOT NULL,
    [FileExtension] VARCHAR (10)    NOT NULL,
    [FileContent]   VARBINARY (MAX) NOT NULL,
    PRIMARY KEY CLUSTERED ([FileID] ASC)
);

目前暫時找不到問題所在，還請各位為我解答，謝謝。