System.Web.Helpers Encrypt for Web Service-CodePudding

I'm working with a company's Web Service retrieve information, the provide a document with sample code. I have already asked them about the bad code but they insist it works. I have been searching for a solution for days which brings me here.

When I asked what namespace is used for Crypto, they send this link. https://docs.microsoft.com/en-us/dotnet/api/system.web.helpers.crypto?view=aspnet-webpages-3.2

First, Crypto does not have an Encrypt method. Below is the code in their docs and I added a couple error comments. Am I using the correct version of System.Web.Helpers?

    public void GetReport(string ApiRequestID, string encryptedUserName)
    {           
        System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

        Uri address = new Uri("https://someURL");
        // Create the web request
        HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
        // Set type to POST
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        StringBuilder data = new StringBuilder();
        data.Append("jobNo="   HttpUtility.UrlEncode(ApiRequestID));
       
        //TripleDES.Key = ""
        //TripleDES.IV = ""

        //Cannot declare a variable of static type System.Web.Helpers.Crypto
        Crypto crypto = new Crypto(key, iv);

        //System.Web.Helpers.Crypto does not contain a definition for Encrypt and no extension method Encrypt 
        //accepting a first argument of type 'System.Web.Helpers.Crypto' could be found 
        //(are you missing a using directive or an assembly reference?)
        String encryptedUserName = crypto.Encrypt("MyUserName");


        data.Append("&encryptedUserName="   HttpUtility.UrlEncode(encryptedUserName));
        // Create a byte array of the data we want to send
        byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
        // Set the content length in the request headers
        request.ContentLength = byteData.Length;

        ReportInfo info = new ReportInfo();
        
        // Write data
        using (Stream postStream = request.GetRequestStream())
        {
            postStream.Write(byteData, 0, byteData.Length);
        }

        // Get response
        using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
        {
            // Get the response stream
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(LeasingReportInfo));
            info = (LeasingReportInfo)ser.ReadObject(response.GetResponseStream());
        }
    }

Thanks for any input.

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