public sealed class RasterBandDefinition : ArcGIS.Core.Data.Definition, System.IDisposable  

{
  var count = rasterDataset.GetBandCount();
  RasterBand rasterBandByName = rasterDataset.GetBandByName(sBandName);
  var index = rasterDataset.GetBandIndex(sBandName);

  // Get a RasterBand from the raster dataset
  RasterBand rasterBand = rasterDataset.GetBand(0);

  // Get the RasterBandDefinition from the raster band.
  RasterBandDefinition rasterBandDefinition = rasterBand.GetDefinition();
  // Get the name of the raster band from the raster band.
  string bandName = rasterBandDefinition.GetName();
}