How to create a raster stretch renderer

static IRasterRenderer stretchRenderer(IRasterDataset rasterDataset)throws Exception{
    //define the from and to colors for the color ramp
    IRgbColor fromColor = new RgbColor();
    fromColor.setRed(255);
    fromColor.setGreen(0);
    fromColor.setBlue(0);
    IColor toColor = new RgbColor();
    fromColor.setRed(0);
    fromColor.setGreen(255);
    fromColor.setBlue(0);
    //create the color ramp
    IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRamp();
    colorRamp.setSize(255);
    colorRamp.setFromColor(fromColor);
    colorRamp.setToColor(toColor);
    boolean[] createColorRamp = {
        false
    };
    colorRamp.createRamp(createColorRamp);
    //create a stretch renderer
    IRasterStretchColorRampRenderer stretchRenderer = new
        RasterStretchColorRampRenderer();
    IRasterRenderer rasterRenderer = (IRasterRenderer)stretchRenderer;
    //set renderer properties
    IRaster raster = rasterDataset.createDefaultRaster();
    rasterRenderer.setRasterByRef(raster);
    rasterRenderer.update();
    stretchRenderer.setBandIndex(0);
    stretchRenderer.setColorRamp(colorRamp);
    //set the stretch type
    IRasterStretch stretchType = (IRasterStretch)rasterRenderer;
    stretchType.setStretchType
        (esriRasterStretchTypesEnum.esriRasterStretch_StandardDeviations);
    stretchType.setStandardDeviationsParam(2);
    return rasterRenderer;
}