Exclude a field/property from the database with Entity Framework 4 & Code-First

I will like to know that is there a way to exclude some fields from the database? For eg:

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string FatherName { get; set; }

    public bool IsMale { get; set; }
    public bool IsMarried { get; set; }

    public string AddressAs { get; set; }
}

How can I exclude the AddressAs field from the database?

for future reference: you can use data annotations MSDN EF - Code First Data Annotations

[NotMapped]        
public string AddressAs { get; set; }

I know this is an old question but in case anyone (like me) comes to it from search...

Now it is possible in entity framework 4.3 to do this. You would do it like so:

builder.Entity<Employee>().Ignore(e => e.AddressAs);