[C#]
PdfDocumentBuilder pdfbuilder = new PdfDocumentBuilder();
PdfDocumentEditor editor = new PdfDocumentEditor(filename);
editor.AddOpenAction(pdfbuilder.ActionFactory.CreateJavaScriptAction("app.alert(\"You are looking at Java script action demo of Nasosoft PDF \\r\\n\\t www.nasosoft.com \")"));
editor.Save(outfile);
[VB.NET]
Dim builder As New PdfDocumentBuilder
Dim editor As New PdfDocumentEditor(filename)
editor.AddOpenAction(builder.ActionFactory.CreateJavaScriptAction("app.alert(""You are looking at Java script action demo of Nasosoft PDF \\r\\n\\t www.nasosoft.com "")"))
editor.Save(outfile)