Add Emoji Icon feature to ASP.Net TextBox

There is not enough examples or tutorial for the link you have provided.

You can try out the following TinyMCE Editor. It also ha Emojis.

HTML

<script type="text/javascript" src="//tinymce.cachefly.net/4.0/tinymce.min.js"></script>
<script type="text/javascript">
    tinymce.init({
        selector: 'textarea',
        plugins: "emoticons",
        toolbar: "emoticons",
        width: 500
    });
</script>
<asp:TextBox ID="txtMessage" runat="server" TextMode="MultiLine" />

Screenshot