How to clear a pictureBox?

I tried to set the pictureBox1 Image to null but it didn’t clear it before adding the next image. so each time it’s adding another image it’s adding it on the one before.

then I tried to add a Dispose for the pictureBox1 Image but then it throw exception on the line:

pictureBox1.Image = milimeters[macTrackBar4.Value - 1];

without the Disposing line it’s not throwing the exception but also not clearing the pictureBox1 before adding the next image.

private void macTrackBar4_ValueChanged(object sender, decimal value)
{
    if (milimeters != null && macTrackBar4.Value > 0 && macTrackBar4.Value <= milimeters.Length)
    {
        // Dispose of the current image if it exists
        if (pictureBox1.Image != null)
        {
            pictureBox1.Image.Dispose();
        }

        // Clear the PictureBox
        pictureBox1.Image = null;
        pictureBox1.Invalidate(); // Invalidate to clear the PictureBox

        // Assign the new image
        pictureBox1.Image = milimeters[macTrackBar4.Value - 1];
    }
}

>Solution :

When assigning a new image to a pictureBox it automatically removes the previous image and replaces it with the new image. There is no need to dispose of the old image unless you want the pictureBox to be blank for an amount of time before switching to the new one. The code below will replace the image of a pictureBox with a new one.

pictureBox1.Image = Resources.MyPicture;

Replace MyPicture with your imported image or resource.