JSFiddle - React, Tailwind, and code Playground

HTML

<%@ WebHandler Language="C#" CodeBehind="CheckUserName.ashx.cs" Class="Dating.CheckUserName" %>

JavaScript

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Configuration;
using Dating.DataControl;
using System.Data;

namespace Dating
{
    /// <summary>
    /// Summary description for CheckUserName
    /// </summary>
    public class CheckUserName : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            string user_name = context.Request.QueryString["username"];
            string output = "here";
            output = CheckUserNameAvailability(user_name);
            context.Response.Write(output);
            context.Response.End();

        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
}
}
}