AssignCustomersByClosestStoreParameters parameters = new AssignCustomersByClosestStoreParameters();
             
// The PointLayer type could take either data as
// ESRI.ArcGIS.Client.Tasks.FeatureSet, ESRI.ArcGIS.Client.BAServer.FolderItem,
// or a list of ESRI.ArcGIS.Client.BACore.PointRecord items, e.g.
//List<PointRecord> points = new List<PointRecord>() {
//    new PointRecord("Store 1", "Steiner St. & Geary Blvd", "1", 37.78415, -122.4346)};
             
// Set Stores as a list of PointRecord using implicit cast operator.
parameters.Stores = points;
             
// The StoreIDField parameter is ignored if stores are specified as a list of PointRecord.
//parameters.StoreIDField = "STORE_ID";
             
// Set Customers with a valid data type.
parameters.Customers = customers;
             
// Set the field name to link customers with a store.
parameters.CustomerLinkField = "STORE_ID";
             
// Optionally restrict analysis to ExtendData object specified with myExtent.
//parameters.AnalysisExtent = myExtent;
             
assignCustomersByClosestStoreTask.ExecuteAsync(parameters, new AsyncResponder(resultHandler, faultHandler));