Password Encryption Decryption model in Class file

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                                        First You Add This Code in Class File
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace ModelName.Models
{
   public class Encryptiondecryption
   {
       public string Decode(string sData)
       {

           System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();

           System.Text.Decoder utf8Decode = encoder.GetDecoder();

           byte[] todecode_byte = Convert.FromBase64String(sData);

           int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

           char[] decoded_char = new char[charCount];

           utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);

           string result = new String(decoded_char);

           return result;

       }
       public string Encode(string sData)
       {
           try
           {
               byte[] encData_byte = new byte[sData.Length];

               encData_byte = System.Text.Encoding.UTF8.GetBytes(sData);

               string encodedData = Convert.ToBase64String(encData_byte);

               return encodedData;

           }
           catch (Exception ex)
           {
               throw new Exception("Error in base64Encode" + ex.Message);
           }
       }
   }
}

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                                        Then go to the  Admin Controlller Apply This Code
                                     Firstly Set The TextBox Name and Etc another Names
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Models Name;
namespace Controller Name
{
   public class AdminController : Controller
   {
       //
       // GET: /Admin/

       public ActionResult Index()
       {
           return View();
       }
      
       public ActionResult Login()
       {
               return View();

       }
       [HttpPost]
       public ActionResult Http_login(string username, string password)
       {
        
    
           YourEntityName ObjEntity = new YourEntityName();
           var Admindata = (from p in ObjEntity.tbl_User where p.username == username select p).SingleOrDefault();
                      if (Admindata!= null)
           {
               Encryptiondecryption Obj_Encryptiondecryption = new Encryptiondecryption();
               string decdrypt_password = Obj_Encryptiondecryption.Decode(Admindata.password);
               if (decdrypt_password == password)
               {
                   Session["User"] = Admindata.username;

                 return RedirectToAction("Index", "ShareYourStory");
               }
               else
               {                  
                   ModelState.AddModelError("Msgpsd", "Wrong Password!");
                    return View("Login");
               }
           }
           else
           {
               
               ModelState.AddModelError("Msgusr", "Wrong Usename!");  
                 return View("Login");
           }
       }

       // Change Password of admin
       public ActionResult Change_Password()
       {
           if (Session["User"] == null)
           {
               return RedirectToAction("Login", "Admin");
           }
           else
           {

               if (TempData["success"] == null)
               {
                   TempData["success"] = "";
                   return View();
               }
               else
               {
                   return View();
               }
               
           }
       }

       // Change Password of admin Http_Post

       [HttpPost]
       public ActionResult Http_ChangePassword( string txt_cnf_new_password, string txt_old_password)
       {
           EntityName obj_YourEntities = new EntityNameEntities();
         string  username = Session["user"].ToString();
           var admindata = (from data in obj_YourEntities.tbl_User where data.username ==username  select data).SingleOrDefault();
           if (admindata != null)
           {
               Encryptiondecryption Objencryptcls = new Encryptiondecryption();
            string   encrypt_old_password=Objencryptcls.Decode(admindata.password);
            if (encrypt_old_password == txt_old_password)
               {
                    YourEntityName obj_YourEntities1 = newYourEntityName();
                   tbl_User objUser = new tbl_User();
                   //Encryptiondecryption Objencryptcls = new Encryptiondecryption();
                   string encrypt_pass = Objencryptcls.Encode(txt_cnf_new_password);
                   objUser.password = encrypt_pass;
                   objUser.username = username;
                   objUser.userid = 1;
                   obj_YourEntities1.tbl_User.Attach(objUser);
                   obj_YourEntities1.ObjectStateManager.ChangeObjectState(objUser, System.Data.EntityState.Modified);
                   obj_YourEntities1.SaveChanges();
                   TempData["success"] = "Password changed successfully";
                     
                    return View("Change_Password");
               }
               else
               {
                   ModelState.AddModelError("Msgpsd", "Wrong Password!");
                   return View("Change_Password");
                   
               }
           }
           else
           {
               ModelState.AddModelError("Msgusr", "Wrong Usename!");  
              return View("Change_Password");
           }
       }
       // action for logoff admin
       [HttpPost]
       public ActionResult logoff()
       {
           Session["User"] = null;
           return RedirectToAction("Login", "Admin");
       }
   }

}