Creates a connection to the CRM, and retrieves all account records (Organisations) from the CRM. I'm guessing, one of the columns is no longer valid??

gistfile1.cs

        public List<Entity> GetOrganizations()
        {
            List<Entity> accounts = null;
            // Establish a connection to the organization web service using CrmConnection.
            Microsoft.Xrm.Client.CrmConnection connection = CrmConnection.Parse(this.ConnectionString);

            using (_orgService = new OrganizationService(connection))
            {
                // Retrieve the several attributes from the new account.      
                QueryExpression query = new QueryExpression();

                
                query.EntityName = "account";
                query.ColumnSet = new ColumnSet(true);

                query.LinkEntities.Add(new LinkEntity("account", "contact", "primarycontactid", "contactid", JoinOperator.LeftOuter));
                query.LinkEntities[0].Columns.AddColumns("firstname", "lastname");
                query.LinkEntities[0].EntityAlias = "primarycontact";
                
                accounts = _orgService.RetrieveMultiple(query).Entities.ToList();

            }
            return accounts;
        }