Open docx from asp.net

// Use the component in free mode.
ComponentInfo.SetLicense("FREE-LIMITED-KEY");

// Create a new empty document.
DocumentModel document = new DocumentModel();

// Add document content.
document.Sections.Add(new Section(document, new Paragraph(document, "Hello World!")));

// Microsoft Packaging API cannot write directly to Response.OutputStream.
// Therefore we use temporary MemoryStream.
using (MemoryStream documentStream = new MemoryStream())
{
    document.Save(documentStream, SaveOptions.DocxDefault);

    // Stream file to browser.
    Response.Clear();
    Response.ContentType = "application/vnd.openxmlformats";
    Response.AddHeader("Content-Disposition", "attachment; filename=Document.docx");

    documentStream.WriteTo(Response.OutputStream);

    Response.End();
}