ASP.net 數據庫取圖讀圖的方法

<%@ WebHandler Language="C#" Class="GenericHandler1" %>

using System;
using System.Web;
using System.Data;
using System.Data.SqlClIEnt;

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public class GenericHandler1 : IHttpHandler {

    const int BUFFERSIZE = 1024;
   
    public bool IsReusable {
        get {
            return false ;
        }
    }
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "image/jpeg";
        context.Response.Cache.SetCacheability(HttpCacheability.Public);
        context.Response.BufferOutput = false  ;
        //調用寫圖片的方法,並且傳入參數/
        string IMGID = context.Request.QueryString.Get("IMGID");
        System.IO.Stream _stream = context.Response.OutputStream;
        if (_stream == null)
        {
            throw new Exception("還沒有傳入參數嗎?! Error!!!!");
        }
        else
        {
            writeSingleImage(IMGID, _stream); 
        }
     
        context.Response.End();
 
    }

    private void writeSingleImage(string _IMGID, System.IO.Stream _output)
    {
       // connDatabase co = new connDatabase();