C#

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Bitmap bmp = new Bitmap(@"C:\Users\Ali\Desktop\1.png");
            int w = bmp.Width;
            int h = bmp.Height;
            Lst_Data lastpointcolor = new Lst_Data() ;
            for (int y = 0; y < h; y++)
            {
                for (int x = 0; x < w; x++)
                {
                    Color c = bmp.GetPixel(x, y);
                    if (c.A != Color.Transparent.A)
                    {
                        if (lastpointcolor.color.A == Color.Transparent.A)
                        {
                            bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
                        }
                    }
                    lastpointcolor = new Lst_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
                }
            }

            for (int y = h-1; y > 0; y--)
            {
                for (int x = w-1; x > 0; x--)
                {
                    Color c = bmp.GetPixel(x, y);
                    if (c.A != Color.Transparent.A)
                    {
                        if (lastpointcolor.color.A == Color.Transparent.A)
                        {
                            bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
                        }
                    }
                    lastpointcolor = new Lst_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
                }
            }
            pictureBox1.Image = bmp;
        }

 public struct Lst_Data
    {
        public Point point;
        public Color color;
    }

char[] buffer = new char[size];
int numberOfChars;
fixed (char* bufferptr = buffer)
fixed (byte* rawptr = raw)
    numberOfChars = MultiByteToWideChar(936, 0, rawptr, readSize, bufferptr, buffer.Length);

private void PdfReport(string address)
{
    //Load the stream from the local system.
    FileStream fs = new FileStream(address, FileMode.Open);
    PdfSource = fs;
}

private void PdfReport(string address)
{
    //Load the stream from the local system.
    FileStream fs = new FileStream(address, FileMode.Open);
    PdfSource = fs;
    fs.Dispose();
}