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");
}
}