Async/await call to asmx service
<p>I am consuming a asmx service and trying to do async/await while trying to call it</p>

<p>Currently My controller is like below</p>

<pre><code>Public ActionResult Index()
{
   var data = _repository.GetDataFromAsmxService(somedata);
}
</code></pre>

<p>//RepositoryClass Method</p>

<pre><code>public List&lt;ObjectToReturn&gt; GetDataFromAsmxService(somedata)
{
   var res = _asmxService.GetReportData(somedata);
   var result = process(res);
   return result;
}
</code></pre>

<p>Upon further looking at refrence.cs file generated found there were void async and onCompleted methods for equivalent calls.</p>

<p>So i changed it to</p>

<pre><code>        private void GetReportDataCallBack(object sender, GetReportDataCompletedEventArgs e)
        {
            var res = e.Result;
            var result = process(res);
        }

        public List&lt;ObjectToReturn&gt; GetDataFromAsmxService(somedata)
{
   _asmxService.GetReportDataCompleted +=GetReportDataCallBack;
   _asmxService.GetReportDataAsync(somedata);

}
</code></pre>

<p>but now the callback happens to the Event delegate so my controller expecting a return data won’t get it. 
<strong>what is a better way to call async/await from controller and get the data from asmx webservice</strong></p>

<p>Code From Refenrece.cs
//Generated code</p>

<pre><code>[System.Web.Services.Protocols.SoapHeaderAttribute("ApiAuthenticationValue")]
        [System.Web.Services.Protocols.SoapDocumentMethodAttribute("http://webservice.com/GetReportData", Use=System.Web.Services.Description.SoapBindingUse.Literal, ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Bare)]
        [return: System.Xml.Serialization.XmlElementAttribute(Namespace="http://webservice.com/")]
        public GetReportDataResponse GetReportData([System.Xml.Serialization.XmlElementAttribute(Namespace="http://webservice.com/")] GetReportDataRequest GetReportDataRequest) {
            object[] results = this.Invoke("GetReportData", new object[] {
                        GetReportDataRequest});
            return ((GetReportDataResponse)(results[0]));
        }

        /// &lt;remarks/&gt;
        public void GetReportDataAsync(GetReportDataRequest GetReportDataRequest) {
            this.GetReportDataAsync(GetReportDataRequest, null);
        }

        /// &lt;remarks/&gt;
        public void GetReportDataAsync(GetReportDataRequest GetReportDataRequest, object userState) {
            if ((this.GetReportDataOperationCompleted == null)) {
                this.GetReportDataOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGetReportDataOperationCompleted);
            }
            this.InvokeAsync("GetReportData", new object[] {
                        GetReportDataRequest}, this.GetReportDataOperationCompleted, userState);
        }

        private void OnGetReportDataOperationCompleted(object arg) {
            if ((this.GetReportDataCompleted != null)) {
                System.Web.Services.Protocols.InvokeCompletedEventArgs invokeArgs = ((System.Web.Services.Protocols.InvokeCompletedEventArgs)(arg));
                this.GetReportDataCompleted(this, new GetReportDataCompletedEventArgs(invokeArgs.Results, invokeArgs.Error, invokeArgs.Cancelled, invokeArgs.UserState));
            }
        }
</code></pre>