public AdminUser Login(string username, string password)
{
AdminUser model = new AdminUser();
ISpecification <AdminUser> spec = SpecificationBuilder.Create <AdminUser>();
spec.Equals(m => m.Password, ITOrm.Utility.Encryption.SecurityHelper.GetMD5String(password));
spec.Equals(m => m.UserName, username);
model = AdminUser.Single(spec);
return(model);
}