public static Config SetConfigValueEx(this DataServiceQuery <Config> service, string name,
string context, string propertyName, object propertyValue)
{
var collectionCtx = service.Context;
var setConfigValueUri = service.SetConfigValue(name, context, propertyName, string.Empty).RequestUri;
var config = collectionCtx.ExecuteAsync <Config>(setConfigValueUri, "POST", true,
new BodyOperationParameter("Name", name),
new BodyOperationParameter("Context", context),
new BodyOperationParameter("Property", propertyName),
new BodyOperationParameter("Value", propertyValue)).GetAwaiter().GetResult().Single();
return(config);
}