AForge.Imaging.Filters.Closing.Apply C# (CSharp) Method

        public Bitmap Apply( Bitmap image )
        {
            Bitmap tempImage = dilatation.Apply( image );
            Bitmap destImage = errosion.Apply( tempImage );

            tempImage.Dispose( );

            return destImage;
        }

        private void cBFilters_SelectedIndexChanged(object sender, EventArgs e)
        {
            Bitmap pictureTransform = (Bitmap)pbChoose.Image;
                if ((string)cBFilters.SelectedItem == "HSL_Filter")
                {
                    AForge.Imaging.Filters.SaturationCorrection filter = new SaturationCorrection(0.1);
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Mediana")
                {
                    AForge.Imaging.Filters.Median filter = new Median();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                /*if ((string)cBFilters.SelectedItem == "Fourier_Transformation")
                {
                 Complex[] dst = new Complex[n];

                    AForge.Math.FourierTransform filter = AForge.Math.FourierTransform.DFT();// .FromBitmap(pictureTransform);
                    Bitmap newImage = filter.Apply();
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }*/

                if ((string)cBFilters.SelectedItem == "Binarization")
                {
                    pictureTransform = Grayscale.CommonAlgorithms.BT709.Apply(pictureTransform);
                    Threshold threshold = new Threshold(127);
                    threshold.ApplyInPlace(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = pictureTransform;
                }

                if ((string)cBFilters.SelectedItem == "Grayscale")
                {
                    AForge.Imaging.Filters.Grayscale filter = new AForge.Imaging.Filters.Grayscale(0.2125, 0.7154, 0.0721);
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "FillHoles")
                {

                    pictureTransform = Grayscale.CommonAlgorithms.BT709.Apply(pictureTransform);
                    Threshold threshold = new Threshold(127);
                    threshold.ApplyInPlace(pictureTransform);
                    AForge.Imaging.Filters.FillHoles filter = new AForge.Imaging.Filters.FillHoles();
                    filter.MaxHoleHeight = 5;
                    filter.MaxHoleWidth = 15;
                    filter.CoupledSizeFiltering = false;
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Opening")
                {
                    AForge.Imaging.Filters.Opening filter = new AForge.Imaging.Filters.Opening();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Closing")
                {
                    AForge.Imaging.Filters.Closing filter = new AForge.Imaging.Filters.Closing();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Erosion")
                {
                    AForge.Imaging.Filters.Erosion filter = new AForge.Imaging.Filters.Erosion();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Dilatation")
                {
                    AForge.Imaging.Filters.Dilatation filter = new AForge.Imaging.Filters.Dilatation();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }

                if ((string)cBFilters.SelectedItem == "Edges")
                {
                    AForge.Imaging.Filters.Edges filter = new AForge.Imaging.Filters.Edges();
                    Bitmap newImage = filter.Apply(pictureTransform);
                    pbChoose.SizeMode = PictureBoxSizeMode.CenterImage;
                    pBNew.Image = newImage;
                }
        }