public Nullable<bool> IsVisible {get; set;}

{
    //Uris to the datasets for the layers to be created
    var uriShp = new Uri(@"c:\data\roads.shp");
    var uriSde = new Uri(@"c:\MyDataConnections\MySDE.sde\Census");
    var uri = new Uri(@"http://sampleserver6.arcgisonline.com/arcgis/rest/services/NapervilleShelters/FeatureServer/0");
    // Create a list of URIs to be used for creating multiple layers
    var uris = new List<Uri>() { uriShp, uriSde, uri }; ;

    // set the index and visibility
    var blkParams = new BulkLayerCreationParams(uris);
    blkParams.MapMemberPosition = MapMemberPosition.Index;
    blkParams.MapMemberIndex = 2;
    blkParams.IsVisible = false;
    // Create multiple layers using the BulkLayerCreationParams
    //Note: Needs QueuedTask to run
    var layers = LayerFactory.Instance.CreateLayers(blkParams, MapView.Active.Map);
}