Create grid data

public static IRasterDataset CreateRasterDataset(string Path, string FileName){    try    {        IRasterWorkspace2 rasterWs = OpenRasterWorkspace(Path);        //Define the spatial reference of the raster dataset.        ISpatialReference sr = new UnknownCoordinateSystemClass();        //Define the origin for the raster dataset, which is the lower left corner of the raster.        IPoint origin = new PointClass();        origin.PutCoords(15.0, 15.0);        //Define the dimensions 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 TIFF format.        IRasterDataset rasterDataset = rasterWs.CreateRasterDataset(FileName, "TIFF",            origin, width, height, xCell, yCell, NumBand, rstPixelType.PT_UCHAR, sr,            true);        //If you need to set NoData for some of the pixels, you need to set it on band         //to get the raster band.        IRasterBandCollection rasterBands = (IRasterBandCollection)rasterDataset;        IRasterBand rasterBand;        IRasterProps rasterProps;        rasterBand = rasterBands.Item(0);        rasterProps = (IRasterProps)rasterBand;        //Set NoData if necessary. For a multiband image, a NoData value needs to be set for each band.        rasterProps.NoDataValue = 255;        //Create a raster from the dataset.        IRaster raster = rasterDataset.CreateFullRaster();        //Create a pixel block using the weight and height of the raster dataset.         //If the raster dataset is large, a smaller pixel block should be used.         //Refer to the topic "How to access pixel data using a raster cursor".        IPnt blocksize = new PntClass();        blocksize.SetCoords(width, height);        IPixelBlock3 pixelblock = raster.CreatePixelBlock(blocksize)as IPixelBlock3;        //Populate some pixel values to the pixel block.        System.Array pixels;        pixels = (System.Array)pixelblock.get_PixelData(0);        for (int i = 0; i < width; i++)            for (int j = 0; j < height; j++)                if (i == j)                    pixels.SetValue(Convert.ToByte(255), i, j);                else                    pixels.SetValue(Convert.ToByte((i * j) / 255), i, j);        pixelblock.set_PixelData(0, (System.Array)pixels);        //Define the location that the upper left corner of the pixel block is to write.        IPnt upperLeft = new PntClass();        upperLeft.SetCoords(0, 0);        //Write the pixel block.        IRasterEdit rasterEdit = (IRasterEdit)raster;        rasterEdit.Write(upperLeft, (IPixelBlock)pixelblock);        //Release rasterEdit explicitly.        System.Runtime.InteropServices.Marshal.ReleaseComObject(rasterEdit);        return rasterDataset;    }    catch (Exception ex)    {        System.Diagnostics.Debug.WriteLine(ex.Message);        return null;    }}public static IRasterWorkspace2 OpenRasterWorkspace(string PathName){    //This function opens a raster workspace.    try    {        IWorkspaceFactory workspaceFact = new RasterWorkspaceFactoryClass();        return workspaceFact.OpenFromFile(PathName, 0)as IRasterWorkspace2;    }    catch (Exception ex)    {        System.Diagnostics.Debug.WriteLine(ex.Message);        return null;    }}