// 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();
}