How to create a raster layer

public static void AddRasterLayer(ESRI.ArcGIS.Carto.IActiveView activeView,
    ESRI.ArcGIS.Geodatabase.IRasterDataset rasterDataset,
    ESRI.ArcGIS.Carto.IRasterRenderer rasterRenderer)
{
    //Create a raster layer from a raster dataset. You can also create a raster layer from a raster.
    ESRI.ArcGIS.Carto.IRasterLayer rasterLayer = new RasterLayerClass();
    rasterLayer.CreateFromDataset(rasterDataset);
    //Set the raster renderer. The default renderer will be used if passing a null value.
    if (rasterRenderer != null)
    {
        rasterLayer.Renderer = rasterRenderer;
    }
    //Add it to a map if the layer is valid.
    if (rasterLayer != null)
    {
        ESRI.ArcGIS.Carto.IMap map = activeView.FocusMap;
        map.AddLayer((ILayer)rasterLayer);
    }
}

Public Shared Sub AddRasterLayer(ByVal activeView As ESRI.ArcGIS.Carto.IActiveView, ByVal rasterDataset As ESRI.ArcGIS.GeodataMyBase.IRasterDataset, ByVal rasterRenderer As ESRI.ArcGIS.Carto.IRasterRenderer)
'Create a raster layer from a raster dataset. You can also create a raster layer from a raster.
Dim rasterLayer As ESRI.ArcGIS.Carto.IRasterLayer = New RasterLayerClass()
rasterLayer.CreateFromDataset(rasterDataset)

'Set the raster renderer. The default renderer will be used if passing a null value.
If Not rasterRenderer Is Nothing Then
    rasterLayer.Renderer = rasterRenderer
End If
'Add it to a map if the layer is valid.
If Not rasterLayer Is Nothing Then
    Dim map As ESRI.ArcGIS.Carto.IMap = activeView.FocusMap
    map.AddLayer(CType(rasterLayer, ILayer))
End If
End Sub