Entity Framework Code First contraint when one column value depends on another

I have the following model:

class RentOrder
{
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
}

How can I add constraint in Entity Framework Code First that StartD开发者_开发技巧ate must be always less than EndDate? The only way I know is to add it by executing SQL-command in overridden Seed method. Is there more simple way, without SQL?

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The only way to solve this problem now, as I mentioned in question, is to write SQL-commands in Seed method:

public class MyDatabaseInitializer : DropCreateDatabaseAlways<MyDatabaseContext>
{
    protected override void Seed(MyDatabaseContext context)
    {
        context.Database.ExecuteSqlCommand(@"ALTER TABLE Orders
            ADD CONSTRAINT C_Dates CHECK(EndDate > StartDate)");
    }
}

And call somewhere on the application start:

Database.SetInitializer(new MyDatabaseInitializer());

---

You can implement the set method and throw a custom exception if the enddate is less then the start date.

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You would need to implement it in both because you would still be able to set the opposite. Here is a quick example (assuming the start and end date cannot be the same day):

class RentOrder
{
    public DateTime StartDate 
    { 
      get { return _startDate }; 
      set 
      {
          if (value >= _endDate)
              throw new Exception("Start Date cannot be greater than End Date");

          _startDate = value; 
      };
    }
    private DateTime _startDate;

    public DateTime EndDate
    { 
      get { return _endDate}; 
      set 
      {
          if (value <= _startDate)
              throw new Exception("End Date cannot be less than Start Date");

          _endDate = value; 
      };
    }
    private DateTime _endDate;
}