DataStorage.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;

namespace TelegramApp
{
    class DataStorage
    {

        public static Guid AppGuid
        {
            get
            {
                return new Guid("{4FB5B96F-1359-419B-BE77-C281AC5253F5}");  //Fixme
            }
        }

        public static Guid AssemblyGuid
        {
            get
            {
                Assembly asm = Assembly.GetExecutingAssembly();
                object[] attr = (asm.GetCustomAttributes(typeof(GuidAttribute), true));
                return new Guid((attr[0] as GuidAttribute).Value);
            }
        }

        public static string UserDataFolder
        {
            get
            {
                Guid appGuid = AppGuid;
                string folderBase = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
                string dir = string.Format(@"{0}\{1}\", folderBase, appGuid.ToString("B").ToUpper());
                return CheckDir(dir);
            }
        }

        public static string UserRoamingDataFolder
        {
            get
            {
                Guid appGuid = AppGuid;
                string folderBase = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
                string dir = string.Format(@"{0}\{1}\", folderBase, appGuid.ToString("B").ToUpper());
                return CheckDir(dir);
            }
        }

        public static string AllUsersDataFolder
        {
            get
            {
                Guid appGuid = AppGuid;
                string folderBase = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);
                string dir = string.Format(@"{0}\{1}\", folderBase, appGuid.ToString("B").ToUpper());
                return CheckDir(dir);
            }
        }

        private static string CheckDir(string dir)
        {
            if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
            return dir;
        }
    }
}