//this method is in "UserController" class that select all available roles form database
[NonAction]
        public List<SelectListItem> GetRoleList()
        {
            var usrMgmt = new UserManagement();
            var RoleList = new List<SelectListItem>();

            foreach (KeyValuePair<string, string> pair in usrMgmt.GetAllRoles())
            {
                RoleList.Add(new SelectListItem { Text = pair.Value, Value = pair.Key, Selected = false });
            }

            return RoleList;
        }
//---------------------------------------------------------------------------
//this method is in "UserController" class that use for editing a user
        [HttpGet]
        public ActionResult Edit(string Username)
        {
            var roles = GetRoleList();
            
            UserManagement usrMgmt = new UserManagement();
            var query = usrMgmt.Select(Username);

            foreach (string role in query.Roles)
            {
                int index = roles.FindIndex(x=>x.Value == role);
                roles[index].Selected = true;
            }
            ViewBag.Roles = roles;

            return View(query);
        }
//--------------------------------------------------------------
//this method is in "UserManagement" class in model layer, return a 
//dictionary<string,string> that first string is english role name and second one is persian role //name
public Dictionary<string,string> GetAllRoles()
        {
            Dictionary<string, string> roles = new Dictionary<string, string>();
            var db = new SamaEntities();
            string query = "";
            string[] roleNames = Roles.GetAllRoles();

            foreach (string role in roleNames)
            {
                query = db.aspnet_Roles.Single(x => x.RoleName == role).Description;
                roles.Add(role, query);
            }
            return roles;
        }

using System;

namespace CultureAndNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            var number = Convert.ToDecimal("12.32");
            Console.WriteLine(number);
        }
    }
}

    public class CultureScope : IDisposable
    {
        private readonly CultureInfo _originalCulture;

        public CultureScope(string culture)
        {
            _originalCulture = Thread.CurrentThread.CurrentCulture;
            Thread.CurrentThread.CurrentCulture = new CultureInfo(culture);
        }

        public void Dispose()
        {
            Thread.CurrentThread.CurrentCulture = _originalCulture;
        }
    }

using (var cultureScope = new CultureScope("fa-IR"))
{
   Console.WriteLine(Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator);
   var number = decimal.Parse("12.32");
   Console.WriteLine(number);
}

 using (var cultureScope = new CultureScope("fa-IR"))
{
   Console.WriteLine(Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator);
   var number = decimal.Parse("12.32", new CultureInfo("en"));
   Console.WriteLine(number);
}

 using (var cultureScope = new CultureScope("fa-IR"))
{
   Console.WriteLine(Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator);
   var number = decimal.Parse("12.32", CultureInfo.InvariantCulture);
   Console.WriteLine(number);
}

Laws of UX is a collection of the key maxims that designers must consider when building user interfaces

<?xml version="1.0"?>
<configuration>
  <appSettings file="AppSettings.config">
  </appSettings>
  <connectionStrings configSource="ConnectionStrings.config">      
  </connectionStrings>
  <!-- ... -->
</configuration>