Conversion from .docx to .pdf

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ASP.NET2

I Need to convert doc/docx to pdf with iTextSharp.dll.

I have converted different extensions to pdf format.

string[] fileType = hdnPath.Value.Split('.');
       StreamReader str = new StreamReader(hdnPath.Value);
       Document doc = new Document();
     //  Element ea = new Element();
       if (fileType[fileType.Length - 1] == "txt")
       {
           PdfWriter.GetInstance(doc, new FileStream(hdnPath.Value.Replace(".txt", ".pdf"), FileMode.Create));
       }
       else if (fileType[fileType.Length - 1] == "docx")
       {
           PdfWriter.GetInstance(doc, new FileStream(hdnPath.Value.Replace(".docx", ".pdf"), FileMode.Create));
       }
       else if (fileType[fileType.Length - 1] == "aspx")
       {
           PdfWriter.GetInstance(doc, new FileStream(hdnPath.Value.Replace(".aspx", ".pdf"), FileMode.Create));
       }
       else if (fileType[fileType.Length - 1] == "cs")
       {
           PdfWriter.GetInstance(doc, new FileStream(hdnPath.Value.Replace(".cs", ".pdf"), FileMode.Create));
       }
       else if (fileType[fileType.Length - 1] == "xlsx")
       {
           PdfWriter.GetInstance(doc, new FileStream(hdnPath.Value.Replace(".xlsx", ".pdf"), FileMode.Create));
       }
       else if (fileType[fileType.Length - 1] == "xlsx")
       {
           lblErrorMessage.Text = "Not required to convert pdf to pdf format";
       }
       else
       {
           lblErrorMessage.Text = "We can't convert this file";
       }
       doc.Open();
       doc.Add(new Paragraph(str.ReadToEnd()));
       doc.Close();

In the above code .docx and xlsx format to pdf are not working