can a web method in a web service accept an xml string and return an xml string?

Posted on 2009-04-11
Last Modified: 2012-08-13
Can somebody please clarify how to parse an xml string in a web method and also return xml in the form of a string? I am not sure if I framed the question meaningfully? My web method's signature is as follows.
public string CreateAccount(string XMLInfo)
In the above method, XMLInfo is a string consisting of xml and I should be able to parse the xml in the web method. And also I would return multiple values but through a single string consisting of again xml. It would be a great help if you could post me a code sample in C#.
Thanks for any help!
Question by:ipjyo
  • 2
LVL 12

Expert Comment

by:Nirmalan Nagenthiran
ID: 24124523
Yes its possible. Pass that XML file as a string and inside the web method convert it back to XML, do all XML processing.
Here is the code piece.


 public string ProcessXML(string xmlInfo)


     XmlDocument document = new XmlDocument();


     // Add more values to the XML file.


     // Return XML as String.

     return document.InnerXml;


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Author Comment

ID: 24124544
Thanks for the response.
could you also clarify how would the consumer of this web method know what input parameters that should be given?
If we pass 5 individual parameters then the consumer will have 5 text boxes to enter data. but how will this happen if we pass xml as a string? what will the consumer see when he tries to access the web service? Thank you!
LVL 12

Accepted Solution

Nirmalan Nagenthiran earned 500 total points
ID: 24124627
Please find the attach code pieces. Let me know your thoughts.
<!-- UserInput.xml -->

<?xml version="1.0" encoding="UTF-8"?>


    <TITLE>Add your Title Here</TITLE>

    <FIRSTNAME>Add your Firstname</FIRSTNAME> 

    <LASTNAME>Add your Lastname</LASTNAME>

    <ADDRESS>Add your address</ADDRESS>

    <TELEPHONE>Add your telephone</TELEPHONE>


// Web Service - Web Method


public string CreateAccount(string xmlinfo)


    // Load XML.

    XmlDocument document = new XmlDocument();


    // Add/Modify values to the XML file.


    // Return XML as String.

    return document.InnerXml;


// Consume WebService

protected void Page_Load(object sender, EventArgs e)


     // Load the UserInput.Xml

     XmlDocument doc = new XmlDocument();


     // Add 5 input values into the XML file

     // Call the Webservice and pass the XML.

     Service1 service = new Service1();

     string responseXML =  service.CreateAccount(doc.InnerText);

     // Again load the response as XML.


     // Do other manipulations here..


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