@using (Html.BeginForm("Changepassword", "Home", FormMethod.Post))
{

       <table class="center">


           <tr>
               <td>Old Password</td>
               <td>
                   @Html.EditorFor(pass => pass.Password)
               </td>
               <td>@Html.ValidationMessageFor(pass => pass.Password)</td>
           </tr>
           <tr class="rowspace">
               <td>New Password</td>

               <td>
                   @Html.EditorFor(pass => pass.NewPassword)
               </td>
               <td>@Html.ValidationMessageFor(pass => pass.NewPassword)</td>
           </tr>

           <tr class="rowspace">
               <td colspan="3" id="button">
                   <input type="submit" value="Change Password" /></td>
           </tr>
           <tr class="rowspace"><td colspan="3">@ViewBag.Message</td></tr>
       </table>

}

public ActionResult Changepassword(tblUser login)
{
   using (UserDetailsEntities db = new UserDetailsEntities())
   {
       var detail = db.tblUsers.Where(log => log.Password == login.Password).FirstOrDefault();
       if (detail != null)
       {
           var userDetail = db.tblUsers.FirstOrDefault(c => c.Email == login.Email);


           if (userDetail != null)
           {
               userDetail.Password = login.NewPassword;

               db.SaveChanges();
               ViewBag.Message = "Record Inserted Successfully!";
           }
           else
           {
               ViewBag.Message = "Password not Updated!";
           }

       }
   }

   return View(login);
}

@using (Html.BeginForm("Changepassword", "Home", FormMethod.Post))
    {
           <table class="center">
             <tr>
                   <td>Email</td>
                   <td>
                       @Html.EditorFor(pass => pass.email)
                   </td>
                   <td>@Html.ValidationMessageFor(pass => pass.email)</td>
               </tr>
               <tr>
                   <td>Old Password</td>
                   <td>
                       @Html.EditorFor(pass => pass.Password)
                   </td>
                   <td>@Html.ValidationMessageFor(pass => pass.Password)</td>
               </tr>
               <tr class="rowspace">
                   <td>New Password</td>

                   <td>
                       @Html.EditorFor(pass => pass.NewPassword)
                   </td>
                   <td>@Html.ValidationMessageFor(pass => pass.NewPassword)</td>
               </tr>

               <tr class="rowspace">
                   <td colspan="3" id="button">
                       <input type="submit" value="Change Password" /></td>
               </tr>
               <tr class="rowspace"><td colspan="3">@ViewBag.Message</td></tr>
           </table>

    }

public ActionResult Changepassword(tblUser login)
    {
       using (UserDetailsEntities db = new UserDetailsEntities())
       {
           var detail = db.tblUsers.Where(log => log.Password == login.Password
           && log.email == login.email).FirstOrDefault();
           if (detail != null)
           {
                   userDetail.Password = login.NewPassword;

                   db.SaveChanges();
                   ViewBag.Message = "Record Inserted Successfully!";

              }
     else
               {
                   ViewBag.Message = "Password not Updated!";
               }


       }

       return View(login);
    }