NodeJS and C# app EBUSY error

I am currently developing an nodeJS app. I use a simple C# program to create a text file. That file is like a token which helps me to continue the execution of nodeJS app.I have the following javascript code:

function take_tool() {
    while(take_tool_flag == false) {
        if(fs.existsSync('D:/flag.txt')) {
            fs.writeFileSync('D:/input_robot.txt', '-1');
            console.log('Robot is taking the tool!');
            fs.unlinkSync('D:/flag.txt');
            take_tool_flag = true;
        }
    }
}

function draw_table() {
    while(draw_table_flag == false && take_tool_flag == true) {
        if(fs.existsSync('D:/flag.txt')) {
            fs.writeFileSync('D:/input_robot.txt', '-3');
            console.log('Robot is drawing the table game!');
            fs.unlinkSync('D:/flag.txt');
            draw_table_flag = true;
        }
    }
}


function game() {

    console.log("Game has started!");

    fs.writeFileSync('D:/input_robot.txt', '-99');

    take_tool();

    draw_table();
}

game();

And this is the code for C# program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 0; i <= 10; i++)
            {
                System.Threading.Thread.Sleep(10000);
                Console.WriteLine("File created!");
                File.Create(@"D:\flag.txt", 1024);
            }
        }
    }
}

I run the nodeJS app with "node filename.js" and then it wait for flag.txt to be created. But when i run C# program i get the following error:

Any ideas? Node version: 6.9.2.

via Codrut Tapu