using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

[assembly: WebResource("script_include.js", "application/x-javascript")]
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:ClientScriptResourceLabel runat=server></{0}:ClientScriptResourceLabel>")]
    public class ClientScriptResourceLabel : WebControl
    {
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string Text
        {
            get
            {
                String s = (String)ViewState["Text"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
                ViewState["Text"] = value;
            }
        }

        protected override void RenderContents(HtmlTextWriter output)
        {
            output.Write(Text);
        }

        protected override void OnPreRender(EventArgs e)
        {
            if (this.Page != null)
            {
                ClientScriptManager manager1 = this.Page.ClientScript;
                manager1.RegisterClientScriptResource(typeof(ClientScriptResourceLabel), "script_include.js");
            }
            base.OnPreRender(e);
        }

    }
}
当然这个WebResource.axd是不存在的，它只是IIS中的一个ISAPI影射。