global.asax.cs
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Configuration;
using System.Web.Security;
using System.Web.SessionState;

namespace ExWeb
{
    public class Global : System.Web.HttpApplication
    {

        protected void Application_Start(object sender, EventArgs e)
        {
            NameValueCollection nvc = WebConfigurationManager.AppSettings;
            Mod_Image.z_thumb_prefix = nvc["Img_tp"];
            Mod_Image.z_preview_prefix = nvc["Img_pp"];
            Mod_Image.PathToImg = nvc["Img_path"];
        }

        protected void Session_Start(object sender, EventArgs e)
        {

        }

        protected void Application_BeginRequest(object sender, EventArgs e)
        {

        }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {

        }

        protected void Application_Error(object sender, EventArgs e)
        {

        }

        protected void Session_End(object sender, EventArgs e)
        {

        }

        protected void Application_End(object sender, EventArgs e)
        {

        }
    }
}