How to create a raster dataset

//This example creates a raster dataset with a specified dimension, populates pixel values, and set a NoData value.
static IRasterDataset createRasterDataset(String path, String fileName)throws
    Exception{
    //Create raster workspace. This example also works with any other workspaces that support raster data such as a file geodatabase (FGDB) workspace.
    //Access the workspace and the SDE workspace.
    IRasterWorkspace2 rasterWs = openRasterWorkspace(path);
    //Define the spatial reference of the raster dataset.
    ISpatialReference sr = new UnknownCoordinateSystem();
    //Define the origin for the raster dataset, which is the lower left corner of the raster.
    IPoint origin = new Point();
    origin.putCoords(15.0, 15.0);
    //Define the dimension of the raster dataset.
    int width = 100; //This is the width of the raster dataset.
    int height = 100; //This is the height of the raster dataset.
    double xCell = 30; //This is the cell size in x direction.
    double yCell = 30; //This is the cell size in y direction.
    int NumBand = 1; // This is the number of bands the raster dataset contains.
    //Create a raster dataset in grid format.
    IRasterDataset rasterDataset = rasterWs.createRasterDataset(fileName, "GRID",
        origin, width, height, xCell, yCell, NumBand, rstPixelType.PT_UCHAR, sr,
        true);
    //Get the raster band.
    IRasterBandCollection rasterBands = new IRasterBandCollectionProxy(rasterDataset)
        ;
    IRasterBand rasterBand;
    IRasterProps rasterProps;
    rasterBand = rasterBands.item(0);
    rasterProps = new IRasterPropsProxy(rasterBand);
    //Set NoData if necessary. For a multiband image, NoData value needs to be set for each band.
    rasterProps.setNoDataValue(255);
    //Create a raster from the dataset.
    IRaster raster = rasterDataset.createDefaultRaster();

    //Create a pixel block.
    IPnt blocksize = new Pnt();
    blocksize.setCoords(width, height);
    IPixelBlock3 pixelblock = new IPixelBlock3Proxy(raster.createPixelBlock
        (blocksize));

    //Populate some pixel values to the pixel block.
    byte[][] pixels = (byte[][])pixelblock.getPixelData(0);
    for (int i = 0; i < width; i++)
        for (int j = 0; j < height; j++)
            if (i == j)
                pixels[i][j] = (byte)255;
            else
                pixels[i][j] = (byte)((i * j) % 255);

    pixelblock.setPixelData(0, pixels);

    //Define the location that the upper left corner of the pixel block is to write.
    IPnt upperLeft = new Pnt();
    upperLeft.setCoords(0, 0);

    //Write the pixel block.
    IRasterEdit rasterEdit = new IRasterEditProxy(raster);
    rasterEdit.write(upperLeft, new IPixelBlockProxy(pixelblock));

    //Release rasterEdit explicitly.
    Cleaner.release(rasterEdit);
    return rasterDataset;
}

static IRasterWorkspace2 openRasterWorkspace(String path)throws Exception{
    //This function opens a raster workspace.
    IWorkspaceFactory workspaceFact = new RasterWorkspaceFactory();
    return new IRasterWorkspace2Proxy(workspaceFact.openFromFile(path, 0));
}