using System;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        //We are passing the xml string here currently we have used the one given below but in actual the webresponse will be passed here which should be a string.

        Dictionary<string,string> myDict = ParseXml(xmlString1);

        if(myDict == null)

        {

            Console.WriteLine("Dictionary is null");

        }

        else

        {

            foreach(KeyValuePair<string, string> ele2 in myDict) 

           { 

               Console.WriteLine("{0} and {1}", ele2.Key, ele2.Value); 

           }

        }

    }

    // This function takes a string (xml Document) and returns an array with two keys PostBack and StartUrl.

    public static Dictionary<string,string> ParseXml(string xmlString)

    {

        try

        {

            XmlDocument doc1 = new XmlDocument();

            //Loads the xml 

            doc1.LoadXml(xmlString);

            var nsManager = new XmlNamespaceManager(doc1.NameTable);

            //sets the two namespaces we have 

            nsManager.AddNamespace("d","http://citrix.com/authentication/response/1");

            nsManager.AddNamespace("wv","http://citrix.com/authentication/response/webview/1");

            //finds the two elements PostBack and StartUrl

            XmlNode node1 = doc1.DocumentElement.SelectSingleNode("//d:AuthenticateResponse/d:AuthenticationRequirements/d:PostBack", nsManager);

            XmlNode node2= doc1.DocumentElement.SelectSingleNode("//d:AuthenticateResponse/d:AuthenticationRequirements/d:Requirements/d:Requirement/d:Credential/wv:WebView/wv:StartUrl",nsManager);

            //creates a Dictionary of <string,string>

            Dictionary<string, string> myDict = new Dictionary<string, string>(); 

            //adds both the keys with there value

            myDict.Add("PostBack",node1.InnerText);

            myDict.Add("StartUrl",node2.InnerText);

            //returns the dictionary

            return myDict;

        }

        catch (Exception ex)

        {

            Console.WriteLine("Exception while reading configuration. \n {0}", ex.Message);

            return null;

        }

    }

        //Below is the XML which is given to be parsed 

    private static string xmlString1 = @"<?xml version=""1.0"" encoding=""utf-8""?>

<AuthenticateResponse xmlns=""http://citrix.com/authentication/response/1"">

    <Status>success</Status>

    <Result>more-info</Result>

    <StateContext />

    <AuthenticationRequirements>

        <PostBack>/CofL3V8dB0eE9LimnW5xvw/ExplicitForms</PostBack>

        <CancelPostBack>/CofL3V8dB0eE9LimnW5xvw/ExplicitForms/Cancel</CancelPostBack>

        <CancelButtonText>Cancel</CancelButtonText>

        <Requirements>

            <Requirement>

                <Credential>

                    <ID>webviewResponseId</ID>

                    <Type>webview</Type>

                    <wv:WebView xmlns:wv=""http://citrix.com/authentication/response/webview/1"">

                        <wv:StartUrl>https://accounts-dsauthweb-internal.cloud.com/CofL3V8dB0eE9LimnW5xvw/oidc/webview</wv:StartUrl>

                    </wv:WebView>

                </Credential>

                <Label><Type>none</Type></Label>

                <Input />

            </Requirement>

        </Requirements>

    </AuthenticationRequirements>

</AuthenticateResponse>";

}