public class CIMInternetServerConnection : CIMInternetServerConnectionBase, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

{
    // Create a connection to the WMS server
    var serverConnection = new CIMInternetServerConnection { URL = "URL of the WMS service" };
    var connection = new CIMWMSServiceConnection { ServerConnection = serverConnection };

    // Add a new layer to the map
    var layerParams = new LayerCreationParams(connection);
    //Note: Needs QueuedTask to run
    var layerCreated = LayerFactory.Instance.CreateLayer<FeatureLayer>(layerParams, MapView.Active.Map);
}