async-await_method_using_only_one_thread, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;

namespace Rextester
{
    public class Program
    {
        //some value, which will can be updated at any time
        //public static string value = "predefined value";  //if already defined
        public static string value = "";                    //or if wait this to be updated
        
        public static Thread thread = null;       // Define one variable for only one thread
        public static string result = null;       // Used to store the returned result from wait_result_value in thread
        
		public static string wait_result_value(){ // my_await_method will wait this recursive method
			if(value != ""){                        //if some condition
				return value;                           //return value
			}else{                                  //else
				Thread.Sleep(2000);					   //sleep in the current Thread, to let value be updated
                value = "Value, after 2000 milliseconds.";   //test update value, after sleeping
				return wait_result_value();                  //recursive return this function
			}
		}        
        
        public static string my_await_method()      //this method will await finish of wait_result_value()
        {
            if(thread != null){                     //if thread already runned and this is a new request
                thread.Abort();                        //Just abort previous thread
            }
            
			thread = new Thread(				//	in this case, Thread.Sleep() incide that method is stopping this thread, not all program stopping.
				() =>
				{
                    if(result!=null){               //  if result was been already defined after running previous thread, and this is not null
                        return;                         //do nothing in this thread, and return.
                    }
					result = wait_result_value();	// save the returned result
				}
			);
            
			thread.Start();							//start thread
			thread.Join();							//extract result from thread, at finish it.
            thread.Abort();                         //Abort thread, after extract this value.
            
            string temp_result = result;            //save result in string temp_result
            result = null;                          //set null to result
			return (string)temp_result;		        //return saved temp_result.
        }

public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine(my_await_method());  //show result
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 2,16 sec, cpu time: 0,09 sec, average memory usage: 24 Mb, average nr of threads: 6, absolute service time: 2,34 sec