Calculate total pixels in an image

Bitmap image1;
  int count;
private void Button1_Click(System.Object sender, System.EventArgs e)
{
 
    try
    {
        // Retrieve the image.
        image1 = new Bitmap(@"C:\Documents and Settings\All Users\" 
            + @"Documents\My Music\music.bmp", true);
 
        int x, y;
 
        // Loop through the images pixels to reset color.
        for(x=0; x        {
            for(y=0; y            {
                Color pixelColor = image1.GetPixel(x, y);
                ++count;
            }
        }
 
        // Set the PictureBox to display the image.
        PictureBox1.Image = image1;
 
        // Display the pixel format in Label1.
         label1.Text = "Pixel format: "+count;
 
    }
    catch(ArgumentException)
    {
        MessageBox.Show("There was an error." +
            "Check the path to the image file.");
    }
}