using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using System.Web.UI;

[assembly: WebResource("MenuPurview.Resource.style.css", "text/css", PerformSubstitution = true)]
namespace MenuPurview
{
    public class MenuCss

    {

　　　　//调用嵌入资源并输出流

        public static string ReadRes(string ResName)
        {
            Assembly myAssembly = Assembly.GetAssembly(typeof(MenuPurview.MenuCss));
            Stream myStream = myAssembly.GetManifestResourceStream(ResName);
            StreamReader sr = new StreamReader(myStream);
            string s = sr.ReadToEnd();
            return s;
        }
    }

}

调用部分

string s=MenuCss.ReadRes("MenuPurview.Resource.style.css") ;