C# relies on Web services for ADUCID - or WSA, see Server side integration basics

Create an instance of AducidApiJsonServiceClient.

This page starts authentication request.

            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
            context.Response.ContentType = "application/json";

            var aducid = new AducidApiServiceClient();
            //get current URI
            string host = "http://" + HttpContext.Current.Request.Url.Host + ":" + HttpContext.Current.Request.Url.Port;
            string query = context.Request.QueryString.ToString();
            var queryParsed = HttpUtility.ParseQueryString(query);
            //should we display QR?
            var generateQr = queryParsed["generateQrCodePicture"];

            //create argument
            var arg = new requestOperationArguments();
            //final URL for iOS 
            arg.peigReturnName = host + "/authenticated";
            arg.qrCodePictureHeight = 300;
            arg.qrCodePictureWidth = 300;
            //ID to support multiple authentications in the same browser
            arg.id = Guid.NewGuid().ToString();
            arg.generateQrCodePicture = generateQr == "true";

            try
            {
                //inititialize authentication and get response
                var response = aducid.startAuthenticationSession(arg);
                //store authId in session - security
                context.Session[arg.id] = response.authId;
                context.Response.ContentType = "application/json";
                //send repsponse to Web API
                context.Response.Write(aducid.toJson(response, ""));
            }
            catch (System.ServiceModel.FaultException e)
            {
                //handle error
                var msgFault = e.CreateMessageFault();
                var errorResult = msgFault.GetDetail<AducidClientException>().result;
                //get error as JSON
                var response = aducid.toErrorJson(errorResult, "error");
                //send JSON to Web API
                context.Response.Write(response);
            }

Just simple “Rewrite” from WSA to C# with authId check

//We have to "proxy" AIM reponses to Web APIuising this page
            var aducid = new AducidApiServiceClient();
            context.Response.ContentType = "application/json";
            try
            {
                string query = context.Request.QueryString.ToString();
                var queryParsed = HttpUtility.ParseQueryString(query);
                //get id from session based on GUID
                var id = queryParsed["id"];
                //get response from AIM
                var response = aducid.getStatus((string)context.Session[id]);
                
                //send response to Web API
                context.Response.Write(aducid.toJson(response, ""));
            }
            catch (System.ServiceModel.FaultException e)
            {
                //handle error
                var msgFault = e.CreateMessageFault();
                var errorResult = msgFault.GetDetail<AducidClientException>().result;
                //get error as JSON
                var response = aducid.toErrorJson(errorResult, "error");
                //send JSON to Web API
                context.Response.Write(response);
            }

On the result page we evaluate the authentication There are two basic results – authentication is OK or an error is thrown:

var aducid = new AducidApiJsonServiceClient();
//read authId from you session
string authId = (string)context.Session["123"];
var aducidResult = aducid.getResult(authId, null);
//parse json
dynamic aducidResultObj = JsonConvert.DeserializeObject(aducidResult);
//User primary key i.e. UDI
var udi = aducidResultObj.data.userDatabaseIndex;
//key to further ADUCID operetions on user object (with authId)
string authKey2 = aducidResultObj.data.authKey2;
//prepare response
var response = aducid.endAuthenticationSession(authId, authKey2);
context.Response.ContentType = "text/plain";
//OK do something with your session
//...
//send response
context.Response.Write(response);

This page should contain ADUCID Integration API
Provide start, check and proxy Url.

 
   aducid.setStartOperationUrl("open");
   aducid.setResultOperationUrl("openCheck");
   aducid.setProxyUrl("proxy");

 
   aducid.processResult = function (result) {
                if (result.status == "OK") {
                    alert("atuhenticated");
                    //location.reload();
                }
                else {
                    alert("atuhentication failure");
                }
            }

And create some HTML elements:

<h1>ADUCID Hello World example</h1>
        <div class="row">
            <div class="col-xs-8 col-xs-offset-2">

                <div class="row">
                    <div class="col-xs-8 col-xs-offset-2">
                        <div id="main-button" class="btn btn-primary btn-lg center-block">Authenticate</div>
                    </div>
                </div>
                <div class="row">
                    <img id="qr-code" alt="" class="img-responsive center-block" />
                </div>

                <div class="row text-center">
                    <div id="qr-code-timer" class="qr-code-timer img-responsive center-block"></div>
                    <div id="qr-code-hint" class="qr-code-hint"></div>
                </div>

                <div id="peig-error" style="display: none;">
                    <h2>PEIG Error</h2>
                    <a class='btn  btn-lg' href='http://www.aducid.com/support/' data-lang="aducid_common_installPeig">Install PEIG</a>
                    <br />
                    <div class='btn btn-lg' onclick="location.reload()" data-lang="aducid_common_tryAgain">Try again</div>
                </div>
            </div>
        </div>