How to send 1 million of push notification (APNS) at the same time using PushSharp?

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hi,
to do that i made a web service to send push (by referencing PushSharp library). I request web service through my web application. i retrieve list of device token from database(using web application) send to web service using for loop to send push. and get result/exception for each one. This process is very slow and take long long time to send notification. If anybody suggest me to what should i do i will be grateful to you.

<pre lang="c#"><pre lang="c#">

public ActionResult SendNow(int certificateInfoId, string message, string certificate, int badgeNo, int pushtype, string password, string countryJsonString)
        {
            if (IsPushParameterValid(certificateInfoId, message, certificate, badgeNo, pushtype, password, countryJsonString))
            {
                var countryObject = new JavaScriptSerializer().Deserialize<Country>(countryJsonString);
                var errorList = new List<ErrorList>();
                byte[] certificatePath = System.IO.File.ReadAllBytes(HttpContext.Server.MapPath("~/Content/certificate/" + certificate));
                foreach (var aDeviceToken in countryObject.DeviceTokens)
                {
                    try
                    {
                        var serviceClient = new PushServiceSoapClient();
                        string serviceResult = serviceClient.SendPushNotification(message, badgeNo, pushtype, aDeviceToken.Token, certificatePath, password);

                        if (serviceResult != "Sent Notification")
                        {
                            var delimiters = new[] { ' ' };
                            string[] errorResult = serviceResult.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
                            string errorMessage = ConvertErrorCodeToErrorMessage(errorResult[0]);
                            var error = new ErrorList
                            {
                                CountryName = countryObject.CountryName,
                                ErrorTime = DateTime.Now,
                                ErrorMessage = errorMessage,
                                Token = aDeviceToken.Token
                            };
                            errorList.Add(error);
                        }
                    }
                    catch (Exception ex)
                    {
                        var error = new ErrorList
                         {
                             CountryName = countryObject.CountryName,
                             ErrorTime = DateTime.Now,
                             ErrorMessage = ex.Message,
                             Token = aDeviceToken.Token
                         };
                        errorList.Add(error);
                    }
                }
                if (errorList.Count != 0)
                {
                    ViewBag.Message = "Push Notification does not send to country... ";
                    return PartialView("_SendAllError", errorList.ToList());
                }
                errorList.Clear();
            }
            return View();
        }