Custom adaptor for auto complete

I see that the latest version support custom adaptors but I can't find any documentation and haven't figured out how to make one.  I have a business object that returns the data I need and no web api.  I'd like to write a custom adaptor to interact with my business object and return results.  But how?

<EjsAutoComplete TValue="string">      <EjsDataManager AdaptorInstance="@typeof(CustomAdaptor)" Adaptor="Adaptors.CustomAdaptor"></EjsDataManager>      <AutoCompleteFieldSettings Value="CustomerID"></AutoCompleteFieldSettings>  </EjsAutoComplete>    @code{         public class Orders      {          public Orders() { }          public Orders(int OrderID, string CustomerID)          {              this.OrderID = OrderID;              this.CustomerID = CustomerID;          }          public int OrderID { get; set; }          public string CustomerID { get; set; }      }      public class CustomAdaptor : DataAdaptor      {          static readonly HttpClient client = new HttpClient();          public static List<OrdersDetails> order = OrdersDetails.GetAllRecords();          public override object Read(DataManagerRequest dm, string key = null)          {              IEnumerable<OrdersDetails> DataSource = order;              if (dm.Search != null && dm.Search.Count > 0)              {                  DataSource = DataOperations.PerformSearching(DataSource, dm.Search);  //Search              }              if (dm.Sorted != null && dm.Sorted.Count > 0) //Sorting              {                  DataSource = DataOperations.PerformSorting(DataSource, dm.Sorted);              }              if (dm.Where != null && dm.Where.Count > 0) //Filtering              {                  DataSource = DataOperations.PerformFiltering(DataSource, dm.Where, dm.Where[0].Operator);              }              int count = DataSource.Cast<OrdersDetails>().Count();              if (dm.Skip != 0)              {                  DataSource = DataOperations.PerformSkip(DataSource, dm.Skip);         //Paging              }              if (dm.Take != 0)              {                  DataSource = DataOperations.PerformTake(DataSource, dm.Take);              }              return dm.RequiresCounts ? new DataResult() { Result = DataSource, Count = count } : (object)DataSource;         }      }  }