How to access pixel data using a raster cursor

public static void UsingRasterCursorWithPixelBlock(IRasterDataset2 rasterDs)
{
    try
    {
        //Create a raster. 
        IRaster2 raster2 = rasterDs.CreateFullRaster()as IRaster2;
        //Create a raster cursor with a system-optimized pixel block size by passing a null.
        IRasterCursor rasterCursor = raster2.CreateCursorEx(null);
        //Use the IRasterEdit interface.
        IRasterEdit rasterEdit = raster2 as IRasterEdit;
        //Loop through each band and pixel block.
        IRasterBandCollection bands = rasterDs as IRasterBandCollection;
        IPixelBlock3 pixelblock3 = null;
        long blockwidth = 0;
        long blockheight = 0;
        System.Array pixels;
        IPnt tlc = null;
        object v;
        long bandCount = bands.Count;
        do
        {
            pixelblock3 = rasterCursor.PixelBlock as IPixelBlock3;
            blockwidth = pixelblock3.Width;
            blockheight = pixelblock3.Height;
            pixelblock3.Mask(255);
            for (int k = 0; k < bandCount; k++)
            {
                //Get the pixel array.
                pixels = (System.Array)pixelblock3.get_PixelData(k);
                for (long i = 0; i < blockwidth; i++)
                {
                    for (long j = 0; j < blockheight; j++)
                    {
                        //Get the pixel value.
                        v = pixels.GetValue(i, j);
                        //Do something with the value.
                    }
                }
                //Set the pixel array to the pixel block.
                pixelblock3.set_PixelData(k, pixels);
            }
            //Write back to the raster.
            tlc = rasterCursor.TopLeft;
            rasterEdit.Write(tlc, (IPixelBlock)pixelblock3);
        }
        while (rasterCursor.Next() == true);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(rasterEdit);
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }
}

Public Sub UsingRasterCursorWithPixelBlock(ByVal rasterDS As IRasterDataset2)
    
    Try
    'Create a raster from the raster dataset.
    Dim raster2 As IRaster2
    Dim rasterCursor As IRasterCursor
    raster2 = rasterDS.CreateFullRaster
    'Create a raster cursor using a default pixel block size.
    rasterCursor = raster2.CreateCursorEx(Nothing)
    'Use the IRasterEdit interface to edit the pixel values.
    Dim rasterEdit As IRasterEdit
    rasterEdit = raster2
    'Loop through each pixel block in the raster, modify some pixels, and write back.
    Dim rasterBands As IRasterBandCollection
    Dim pixelBlock As IPixelBlock3
    Dim tlc As IPnt
    Dim k As Long, i As Long, j As Long
    Dim pixels As System.Array
    Dim Value As UInt16 ' Assume the input raster has a 16-bit unsigned type.
    Dim PixelBlockWidth As Long, PixelBlockHeight As Long
    rasterBands = rasterDS
    Do
        'Get the pixel block and size.
        pixelBlock = rasterCursor.PixelBlock
        PixelBlockWidth = pixelBlock.Width
        PixelBlockHeight = pixelBlock.Height
        pixelBlock.Mask(255) 'Set NoData mask.
        For k = 0 To rasterBands.Count - 1
            'Get the pixel array.
            pixels = CType(pixelBlock.PixelData(k), System.Array)
            'Loop through each pixel.
            For i = 0 To PixelBlockWidth - 1
                For j = 0 To PixelBlockHeight - 1
                    'Get the pixel value.
                    Value = pixels.GetValue(i, j)
                    'Do something with the value.
                Next
            Next
            'Set the pixel array to the pixel block.
            pixelBlock.PixelData(k) = pixels
        Next
        'Get the top left corner of the pixel block and write back.
        tlc = rasterCursor.TopLeft
        rasterEdit.Write(tlc, pixelBlock)
    Loop While rasterCursor.Next
    Catch ex As Exception
    System.Diagnostics.Trace.WriteLine(ex.Message)
    End Try
End Sub