httpwebrequest trigger an httphandler, no response wanted

Hello,

we currently have two webservers, i'm trying to make cache system which makes us able to delete a key from the cache in both servers and on different app pools. What i have done is to create a httphandler which i call with querystringparameter called cacheid.

I therefore need to send a request to the httphandler. I see that i need to wait for the response for the http handler. is there a way to skip this. I just want the request to be sent. then right away, free alle resources and contine the executing of the code.my code now lookes like this.

public void DeleteGlobalCacheID(string cacheID)
        {
            DeleteLocalCacheID(cacheID);
 
            foreach (WebServer ws in WebServers)
            {
                foreach (WebApplication wa in WebApplications)
                {
                    DeleteRemoteWebApplicationCache(ws, wa, cacheID);
                }
            }
        }
 
        private void DeleteRemoteWebApplicationCache(WebServer webServer, WebApplication webApplication, string cacheid)
        {
            string url = webServer.Url.ToString().Remove(webServer.Url.ToString().Length-1) + webApplication.Path.ToString() + "GlobalCacheHandler.axd";
 
 
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            string data = "cacheid=" + cacheid ;
            req.ContentLength = data.Length;
 
            SendRequest(req, data);
        }
 
        private void SendRequest(HttpWebRequest req, string data)
        {
            StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
            stOut.Write(data);
            stOut.Close();
        }

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