public sealed class PixelBlock : ArcGIS.Core.CoreObjectsBase, System.IDisposable  

await QueuedTask.Run(() =>
{
  // Create a full raster from the raster dataset.
  ArcGIS.Core.Data.Raster.Raster raster = rasterDataset.CreateFullRaster();

  // Calculate size of pixel blocks to process. Use 1000 or height/width of the raster, whichever is smaller.
  var height = raster.GetHeight();
  var width = raster.GetWidth();
  int pixelBlockHeight = height > 1000 ? 1000 : height;
  int pixelBlockWidth = width > 1000 ? 1000 : width;

  // Create the raster cursor using the height and width calculated.
  RasterCursor rasterCursor = raster.CreateCursor(pixelBlockWidth, pixelBlockHeight);

  // Use a do-while loop to iterate through the pixel blocks of the raster using the raster cursor.
  do
  {
    // Get the current pixel block from the cursor.
    using (PixelBlock currentPixelBlock = rasterCursor.Current)
    {
      // Do something with the pixel block...
    }

    // Once you are done, move to the next pixel block.
  }
  while (rasterCursor.MoveNext());
});

await QueuedTask.Run(() =>
{
  // Create a full raster from the raster dataset.
  ArcGIS.Core.Data.Raster.Raster raster = rasterDataset.CreateFullRaster();

  // Calculate size of pixel block to create. Use 128 or height/width of the raster, whichever is smaller.
  var height = raster.GetHeight();
  var width = raster.GetWidth();
  int pixelBlockHeight = height > 128 ? 128 : height;
  int pixelBlockWidth = width > 128 ? 128 : width;

  // Create a new (blank) pixel block.
  PixelBlock currentPixelBlock = raster.CreatePixelBlock(pixelBlockWidth, pixelBlockHeight);

  // Read pixel values from the raster dataset into the pixel block starting from the given top left corner.
  raster.Read(0, 0, currentPixelBlock);

  // Do something with the pixel block...

  // Write the pixel block to the raster dataset starting from the given top left corner.
  raster.Write(0, 0, currentPixelBlock);
});