private void btnStart_Click(object sender, EventArgs e) { Bitmap oldIm = (Bitmap)Image.FromFile(txtImg1.Text).Clone(); Bitmap newIm = (Bitmap)Image.FromFile(txtImg2.Text).Clone(); Rectangle rect = Rectangle.Empty; SCD = new ScreenChangeDetect(this, oldIm); Bitmap imageChanged = SCD.Check(newIm, ref rect); picBox.Image = (Bitmap)imageChanged.Clone(); }