Reading DataCollection<Entity> from Dynamics CRM using C#

Question

I am trying to pull and read the entity from Dynamics CRM using C#. I am using retrieveMultiple method and all I am getting is Microsoft.Xrm.Sdk.OptionSetValue . When I debug I see 1000 records but every record is showing the same text Microsoft.Xrm.Sdk.OptionSetValue . What am I doing wrong here?

QueryExpression bookQuery = new QueryExpression("new_res")
        {
            ColumnSet = new ColumnSet("new_book"),
            Criteria =
            {
                Conditions =
                {
                    new ConditionExpression()
                    {
                        AttributeName="new_bookid",
                        Operator = ConditionOperator.NotNull
                                            
                    }
                }
            }
        };

DataCollection<Entity> bookList = service.RetrieveMultiple(bookeQuery).Entities;

foreach (var c in bookList)
{
    Console.WriteLine(c.Attributes["new_bookid"]);
}

Answer 1

I just needed to use an EntityCollection :

EntityCollection bookList = (EntityCollection)service.RetrieveMultiple(bookQuery);

if (bookList.Entities.Count > 0)
{
    var record = bookList.Entities[0];
    var recordNumberString = string.Empty;
}