How to manage custom profiles in asp.net 4.0

namespace LD.Sample.BLL
{
    using System;

    [Serializable]
    public class Personal
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
     //   public DateTime DateOfBirth { get; set; }
    }
}

namespace LD.Sample.BLL
{
   using System.Web;
   using System.Web.Profile;

   public class CustomProfile : ProfileBase
   {
      public Personal Personal
      {
         get { return (Personal) GetPropertyValue("Personal"); }
      }

      /// <summary>
      /// Get the profile of the currently logged-on user.
      /// </summary>      
      public static CustomProfile GetProfile()
      {
         return (CustomProfile) HttpContext.Current.Profile;
      }

      /// <summary>
      /// Gets the profile of a specific user.
      /// </summary>
      /// <param name="userName">The user name of the user whose profile you want to retrieve.</param>
      public static CustomProfile GetProfile(string userName)
      {
         return (CustomProfile) Create(userName);
      }
   }
}

<profile defaultprovider="LD.SampleWAP.ProfileProvider" 
        inherits="LD.Sample.BLL.CustomProfile">
    <providers>
           <add name="LD.SampleWAP.ProfileProvider">
                type="System.Web.Profile.SqlProfileProvider"
                applicationName="/"
                connectionStringName="LocalSqlServer" />
    </providers>
</profile>