Persisting data using NHibernate 3.0 in ASP.NET/C#

    using System;
    using Microdesk.Domain.Foundation;

    public class Employee : GuidIdentityPersistenceBase<Employee>
    {
        public virtual Guid Id
        { 
            get { return _persistenceId; }
        }
        
        public virtual string Firstname { get; set; }
        public virtual string Lastname { get; set; }
        public virtual string Email1 { get; set; }
        public virtual string Email2 { get; set; }
        public virtual string Extension { get; set; }
        public virtual string Mobile { get; set; }
        public virtual bool Manager { get; set; }
        public virtual Department Department { get; set; }

        public virtual string Fullname
        {
            get { return Firstname + " " + Lastname; }
        }

        public virtual string FormattedMobile()
        {
            return "(" + Mobile.Substring(0, 3) + ")" + " " + Mobile.Substring(3, 3) + "-" + Mobile.Substring(6);
        }
    }


    using System;
    using Microdesk.Domain.Foundation;

    public class Department : GuidIdentityPersistenceBase<Department>
    {
        public virtual Guid Id
        {
            get { return _persistenceId; }
        }

        public virtual string Name { get; set; }
    }

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<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="EmployeePhoneBook.DomainModel"
                   namespace="EmployeePhoneBook.DomainModel"
                   default-access="field.camelcase-underscore"
                   default-lazy="true">

  <class name="Employee" table="Employee" >
    <id name="_persistenceId" column="Id" type="Guid" access="field" unsaved-value="00000000-0000-0000-0000-000000000000" >
      <generator class="guid.comb" />
    </id>
    <version name="_persistenceVersion" column="Version" access="field" type="int" unsaved-value="0"/>
    <property name="Firstname" length="50" not-null="true"/>
    <property name="Lastname" length="50" not-null="true"/>
    <property name="Email1" length="100" />
    <property name="Email2" length="100" />
    <property name="Extension" length="4" />
    <property name="Mobile" length="10" />
    <property name="Manager" not-null="true"/>
    <many-to-one name="Department" class="EmployeePhoneBook.DomainModel.Department" cascade="save-update" not-null="true" >
      <column name="DepartmentId" />
    </many-to-one>
  </class>
</hibernate-mapping>

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<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="EmployeePhoneBook.DomainModel"
                   namespace="EmployeePhoneBook.DomainModel"
                   default-access="field.camelcase-underscore"
                   default-lazy="true">

  <class name="Department" table="Department" >
    <id name="_persistenceId" column="Id" type="Guid" access="field" unsaved-value="00000000-0000-0000-0000-000000000000" >
      <generator class="guid.comb" />
    </id>
    <property name="Name" column="Name" length="100" not-null="true"/>
  </class>
</hibernate-mapping>

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    public interface IEmployeeRepository
    {
        Employee SaveOrUpdateEmployee(Employee emp);
        Employee GetEmployee(Guid Id);
        void DeleteEmployee(Employee emp);
        IList<Employee> GetAllEmployees(); 
    }

    public class EmployeeRepository : Rhino.Commons.NHRepository<Employee>, IEmployeeRepository
    {
        #region Implementation of IEmployeeRepository

        public Employee SaveOrUpdateEmployee(Employee emp)
        {
            return base.SaveOrUpdate(emp);
        }

        public Employee GetEmployee(Guid Id)
        {
            return base.Get(Id);
        }

        public void DeleteEmployee(Employee emp)
        {
            base.Delete(emp);
        }

        public IList<Employee> GetAllEmployees()
        {
            return base.FindAll().ToList<Employee>();
        }

        #endregion
    }

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        [AcceptVerbs(HttpVerbs.Get)]
        public ViewResult EditEmployee(Guid editId)
        {
            Employee employeeToEdit;
            using (UnitOfWork.Start())
            {
                employeeToEdit = _employeeRepository.GetEmployee(editId);
            }

            return View("EditEmployee", employeeToEdit);
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult EditEmployee(Employee employee)
        {
            if (ModelState.IsValid)
            {
                using (UnitOfWork.Start())
                {
                    employee = _employeeRepository.SaveOrUpdateEmployee(employee);
                    UnitOfWork.Current.Flush();
                }
                return RedirectToAction("SelectEmployees");
            }
            return View("EditEmployee", employee);
        }

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