ASP.NET二进制图片怎么转换成JPEG格式在页面输出并能控制大小

ASP.NET二进制图片如何转换成JPEG格式在页面输出并能控制大小？
我现在的做法是用一个handler来读取数据库中的二进制图片，然后展示到页面上。页面上用个image控件来接收图片，设定了width和height。但是这样有个问题，在页面上的图片是我说希望的大小，但是直接复制页面到内容到excel里以后，图片就恢复成原来大小了，很不好看。请问如何解决？

ImageHandler.ashx.cs文件：

C# code

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Data.SqlClient;using System.Configuration;using System.Drawing;using System.IO;namespace Space{    /// <summary>    /// ImageHandler 的摘要说明    /// </summary>    public class ImageHandler : IHttpHandler    {        private string strConn = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString; //获取配置文件        public void ProcessRequest(HttpContext context)        {            string imageID = context.Request.QueryString["ImID"];            SqlConnection conn = new SqlConnection(strConn);            conn.Open();            string strQuery = @"select Photo from dbo.[User] where ID='" + imageID + "'";            SqlCommand cmd = new SqlCommand(strQuery, conn);            SqlDataReader sdr = cmd.ExecuteReader();            sdr.Read();            if (sdr[0] != DBNull.Value)            {                context.Response.ContentType = "image/jpeg";                context.Response.BinaryWrite((Byte[])sdr[0]);                //获取原始图片高度和宽度                MemoryStream s = new MemoryStream((Byte[])sdr[0]);                Image img = Image.FromStream(s);                int width = img.Width;                int height = img.Height;                            }            conn.Close();            context.Response.End();        }        public bool IsReusable        {            get            {                return false;            }        }    }}

HTML code

<td id="tdImage" style="width: 67px;" runat="server">                        <asp:Image ID="image1" runat="server" ImageUrl='<%# "ImageHandler.ashx?ImID="+Eval("UID") %>'                            Height='100px' Width='65px' />                    </td>

C# code

Response.ClearContent();MemoryStream s = new MemoryStream((Byte[])sdr[0]);System.Drawing.Image img = System.Drawing.Image.FromStream(s);System.Drawing.Image image = img.GetThumbnailImage(100, 65, null, IntPtr.Zero);image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);image.Dispose();img.Dispose(); Response.End();