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I am consuming soap service in my rest web api, then I am getting the error: soap is an undeclared prefix. Here is my code example.

[System.Web.Mvc.HttpPost]

public string ServiceFT([FromBody] FT form)

{

    //Calling CreateSOAPWebRequest method  

    HttpWebRequest request = CreateSOAPWebRequest();



    XmlDocument SOAPReqBody = new XmlDocument();

    //SOAP Body Request  

    SOAPReqBody.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?>  

    <soap:Envelope 

    xmlns:soapenv=""http://schemas.xmlsoap.org/soap/envelope/"" 

    xmlns:rev=""http://tempuri.org/ReversalFTMsgSet"">  

     <soapenv:Header></soapenv:Header>

     <soap:Body>  

        <rev:ReversalStatusReq>               

          <PARTNER_ID>" + form.PARTNER_ID + @"</PARTNER_ID>  

          <USERNAME>" + form.USERNAME + @"</USERNAME>  

          <PASSWORD>" + form.PASSWORD + @"</PASSWORD>  

          <FT_IDENTIFIER>" + form.FT_IDENTIFIER + @"</FT_IDENTIFIER>  

          <TAG1>" + form.TAG1 + @"</TAG1>  

          <TAG2>" + form.TAG2 + @"</TAG2>  

          <TAG3>" + form.TAG3 + @"</TAG3>  

        </rev:ReversalStatusReq>  

      </soap:Body>  

    </soap:Envelope>");





    using (Stream stream = request.GetRequestStream())

    {

        SOAPReqBody.Save(stream);

    }

    //Geting response from request  

    using (WebResponse Serviceres = request.GetResponse())

    {

        using (StreamReader rd = new 

     StreamReader(Serviceres.GetResponseStream()))

        {

            //reading stream  

            var ServiceResult = rd.ReadToEnd();

            //writting stream result on console  

            string unescapedString = Regex.Unescape(ServiceResult);

            return unescapedString;

            // Console.WriteLine(ServiceResult);

            //Console.ReadLine();

        }

    }

}

and here is the CreateSOAPWebRequest method:

 public HttpWebRequest CreateSOAPWebRequest()

{

    //Making Web Request  

    HttpWebRequest Req = (HttpWebRequest)WebRequest.Create(@"http://15.230.20.18:7806/FTService");

    //SOAPAction  

    Req.Headers.Add(@"SOAPAction:http://tempuri.org/FTService");

    //Content_type  

    Req.ContentType = "text/xml;charset="utf-8"";

    Req.Accept = "text/xml";

    //HTTP method  

    Req.Method = "POST";

    //return HttpWebRequest  

    return Req;

}