public SceneLayerDataSourceType GetDataSourceType()

//var pcsl = ...;
//At 2.x - ISceneLayerInfo slInfo = pcsl as ISceneLayerInfo;
//         SceneLayerDataSourceType dataSourceType = slInfo.GetDataSourceType();

SceneLayerDataSourceType dataSourceType = pcsl.GetDataSourceType();
if (dataSourceType == SceneLayerDataSourceType.Service)
{
  //TODO...
}
else if (dataSourceType == SceneLayerDataSourceType.SLPK)
{

}