How to create Word document in UWP?

<Page
   x:Class="CreateWordSample.MainPage"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:local="using:CreateWordSample"
   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
   mc:Ignorable="d">
   <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
         <Button x:Name="button" Content="Create Document" Click="OnButtonClicked" HorizontalAlignment="Center" VerticalAlignment="Center"/>
   </Grid>
</Page>

using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using Windows.Storage.Pickers;
using Windows.Storage;
using Windows.Storage.Streams;

//Creates a new instance of WordDocument (Empty Word Document)
using (WordDocument document = new WordDocument())
{
    //Adds a section and a paragraph to the document
    document.EnsureMinimal();
    //Appends text to the last paragraph of the document
    document.LastParagraph.AppendText("Hello World");
    MemoryStream stream = new MemoryStream();
    //Saves the Word document to MemoryStream
    await document.SaveAsync(stream, FormatType.Docx);
    //Saves the stream as Word document file in local machine
    Save(stream, "Result.docx");
    // Saves the Word document
    async void Save(MemoryStream streams, string filename)
    {
        streams.Position = 0;
        StorageFile stFile;
        if (!(Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons")))
        {
            FileSavePicker savePicker = new FileSavePicker();
            savePicker.DefaultFileExtension = ".docx";
            savePicker.SuggestedFileName = filename;
            savePicker.FileTypeChoices.Add("Word Documents", new List<string>() { ".docx" });
            stFile = await savePicker.PickSaveFileAsync();
        }
        else
        {
            StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
            stFile = await local.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
        }
        if (stFile != null)
        {
            using (IRandomAccessStream zipStream = await stFile.OpenAsync(FileAccessMode.ReadWrite))
            {
                // Write compressed data from memory to file
                using (Stream outstream = zipStream.AsStreamForWrite())
                {
                    byte[] buffer = streams.ToArray();
                    outstream.Write(buffer, 0, buffer.Length);
                    outstream.Flush();
                }
            }
        }
        // Launch the saved Word file
        await Windows.System.Launcher.LaunchFileAsync(stFile);
    }
}