using System;
using System.Collections.Specialized;
using System.Web;
using System.IO;
 
namespace ConfigFileExample.Services
{
    public interface IConfigurationManager
    {
        NameValueCollection AppSettings { get; }

private double _maxFileSize;
private double MaxFileSize
{
    get
    {
        if(_maxFileSize == 0)
        {
            System.Configuration.Configuration config = WebConfigurationManager.OpenWebConfiguration("~");
            HttpRuntimeSection section = config.GetSection("system.web/httpRuntime") as HttpRuntimeSection;
            if (section != null)