add Subscript and Superscript text in a paragraph in the Word Document using OpenXML SDK

using (WordprocessingDocument wordDocument =

              WordprocessingDocument.Create(filepath, WordprocessingDocumentType.Document))

                {

                    // Add a main document part.

                    MainDocumentPart mainPart = wordDocument.AddMainDocumentPart();

                    // Create the document structure and add some text.

                    mainPart.Document = new Document();

                    Body body = mainPart.Document.AppendChild(new Body());

                    Paragraph para = body.AppendChild(new Paragraph());

                    Run run = para.AppendChild(new Run());

                    RunProperties runProperties = new RunProperties();

                    //font family

                    RunFonts font1 = new RunFonts() { Ascii = "Arial" };

                    run.AppendChild(font1);

                    //font size

                    FontSize fs = new FontSize();

                    fs.Val = "22";

                    runProperties.AppendChild(fs);


                    //Super script

                    VerticalTextAlignment v = new VerticalTextAlignment();

                    v.Val = VerticalPositionValues.Superscript;

                    runProperties.AppendChild(v);

                    run.AppendChild(runProperties);

                    run.AppendChild(new Text("Create text in body – CreateWordprocessingDocument  using Superscript"));

                    mainPart.Document.Save();

                    wordDocument.Close();

                }