test.cs

public static string CreateNewDocument() {

	var DocumentName = Guid.NewGuid().ToString() + ".pdf";

	using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) {
		tx.Create();

		byte[] dataTx;

		// save the blank document in the internal TX format
		tx.Save(out dataTx, TXTextControl.BinaryStreamType.InternalUnicodeFormat);

		// create an attachment
		EmbeddedFile embeddedFile = new EmbeddedFile("original.tx", dataTx, null);
		embeddedFile.Relationship = "Source";

		TXTextControl.SaveSettings saveSettings = new TXTextControl.SaveSettings() {
			EmbeddedFiles = new EmbeddedFile[] { embeddedFile }
		};

		// save a PDF with the attached Text Control document embedded
		tx.Save("App_Data/" + DocumentName,
			TXTextControl.StreamType.AdobePDF,
			saveSettings);
	}

	return DocumentName;
}