public void MainMethodCode() { Uri arcgisOnlineURL = new Uri("http://services1.arcgis.com/47GG2ga246DGaLwa/arcgis/rest/services/FeatureServiceName/FeatureServer"); ServiceConnectionProperties arcGISOnline = new ServiceConnectionProperties(arcgisOnlineURL); using (Geodatabase featureService = new Geodatabase(arcGISOnline)) { //These are the relationship clases where the origin layer ID is 0 and destination layer ID is 1 IReadOnlyList <RelationshipClass> relationshipClasses = featureService.OpenRelationshipClass("0", "1"); //These are the relationship clases where the origin layer ID is 1 and destination layer ID is 0 //Note that these will be different from the relationship classes above. IReadOnlyList <RelationshipClass> reverseRrelationshipClasses = featureService.OpenRelationshipClass("1", "0"); } }