I am using Entity Framework with ASP.NET Dynamic Data 3.5. I have a ReportRole class which has been extended as following:

[DisplayColumn("ReportRoleId")]
    [MetadataType(typeof(ReportRole_MD))]
	[DisplayName("Report Role")]
    public partial class ReportRole
	{
        public override string ToString()
        {
            var result = String.Empty;


            using (var context = new MIPortalEntities())
            {


                result = (from rr in context.ReportRole
                              where rr.ReportRoleId == this.ReportRoleId
                              let textToDisplay = rr.Report.ReportName + "--" + rr.Role.RoleName
                              select textToDisplay).First();
            }
            return result;
	    }
	}


	public class ReportRole_MD
	{
        [UIHint("ReadOnlyText")]
        public object ReportRoleId { get; set; }
        [UIHint("ReadOnlyText")]
        public object UpdatedDate { get; set; }
		public object Report { get; set; }
		public object Role { get; set; }


	}

The display text for each report role would be like "ReportName -- RoleName".

By default the ReportRoles are sorted by ReportRoleId, so how can I say the ReportRoles should be sorted based on the value which is returned from ToString() method?

Thanks,