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 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            Zum_Web symbol_to_ID = new Zum_Web();
            symbol_to_ID.url = "https://ebay.de";
            symbol_to_ID.LoaderAsync();

            Zum_Web new_convert = new Zum_Web();
            new_convert.url = "https://www.msn.com/de-de/";
            new_convert.LoaderAsync();

        }
    }

    internal class Zum_Web
    {
        public String url;
        public String result;

        public async Task<string> LoaderAsync()
        {
            using (var httpClient = new HttpClient())
            result = await httpClient.GetStringAsync(url);
            Console.Write(result);
            return "";
        }
    }					

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      Zum_Web symbol_to_ID = new Zum_Web();
            symbol_to_ID.url = "https://ebay.de";
            symbol_to_ID.LoaderAsync();
        
            await Task.Delay(5000);

            Zum_Web new_convert = new Zum_Web();
            new_convert.url = "https://www.msn.com/de-de/";
            new_convert.LoaderAsync();					

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await symbol_to_ID.LoaderAsync();