Ghostscript.NET.Viewer.GhostscriptViewer.ShowPreviousPage C# (CSharp) Method

        public void ShowPreviousPage()
        {
            if (this.CurrentPageNumber - 1 >= this.FirstPageNumber)
            {
                this.ShowPage(this.CurrentPageNumber - 1);
            }
        }

 private void tbPagePrevious_Click(object sender, EventArgs e)
 {
     _viewer.ShowPreviousPage();
 }