How to send web request in queue in C# windows application

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I made an application to trigger web request from window application and forget,means without waiting response.

string url1 = APIUrl + "/SendNotification";
                string url2 = Url + "/SendSOA";

                ASCIIEncoding encoding = new ASCIIEncoding();
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url1);
                request.Method = "Post";
                request.ContentLength = 0;
                request.ContentType = "application/json";
                request.GetResponseAsync(); //Mohan: Method will not wait for response just trigger and forget

                ASCIIEncoding encoding1 = new ASCIIEncoding();
                HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(url2);
                request1.Method = "Post";
                request1.ContentLength = 0;
                request1.ContentType = "application/json";
                request1.GetResponseAsync(); //Mohan: Method will not wait for response just trigger and forget

but when I am trying it by local host URL that time I see that these two methods are running so I want to send request in Queue then it will complete first Request and then will complete second request.

means till one request is not completed second should be in queue.
please help me to do it.

Thanks in Advance.

What I have tried:

I Just tried this but its not working

string APIUrl = ConfigurationManager.AppSettings["APIUrl"].ToString();
                string Url = ConfigurationManager.AppSettings["Url"].ToString();

                Queue httprequest = new Queue();
                string url1 = APIUrl + "/SendNotification";
                string url2 = Url + "/SendSOA";

                ASCIIEncoding encoding = new ASCIIEncoding();
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url1);
                request.Method = "Post";
                request.ContentLength = 0;
                request.ContentType = "application/json";
                httprequest.Enqueue(request);
                request.GetResponseAsync(); //Mohan: Method will not wait for response just trigger and forget

                ASCIIEncoding encoding1 = new ASCIIEncoding();
                HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(url2);
                request1.Method = "Post";
                request1.ContentLength = 0;
                request1.ContentType = "application/json";
                httprequest.Enqueue(request1);
                request1.GetResponseAsync(); //Mohan: Method will not wait for response just trigger and forget

Posted 17-May-18 23:42pm

RakeshKadadhi

Updated 18-May-18 0:59am

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RakeshKadadhi · Accepted Answer · 2018-05-18T01:00:00

This Code works fine for me.

string url1 = APIUrl + "/SendNotification";
        string url2 = Url + "/SendSOA";

        ASCIIEncoding encoding = new ASCIIEncoding();
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url1);
        request.Method = "Post";
        request.ContentLength = 0;
        request.ContentType = "application/json";
        var firstTask = request.GetResponseAsync();

        firstTask.ContinueWith(_ => {
            ASCIIEncoding encoding1 = new ASCIIEncoding();
            HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(url2);
            request1.Method = "Post";
            request1.ContentLength = 0;
            request1.ContentType = "application/json";
            request1.GetResponseAsync(); //Mohan: Method will not wait for response just trigger and forget
        });