Creating a SubFolder inside a list using SharePoint Default WebServices

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MyService;
using System.Xml;
public partial class Default16 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void Button1_Click(object sender, EventArgs e)
{
MyService.Lists listProxy = new MyService.Lists();

//string xmlconst = "0http://vlnrm:100/Sample/Lists/MyList/TestFolder2/Test001/"+txtCreateSubFolder.Text+"";
string str = "TestFolder2/" + txtCreateSubFolder.Text;
if (str.ToString().Contains("&"))
{

//str = str.Replace("&", "/g");

}
string xmlconst = "1" + str + "";




listProxy.Url = "http://vlnrm:100/Sample/_vti_bin/lists.asmx";
listProxy.UseDefaultCredentials = true;


string strListName = "MyList";
XmlDocument xmlDoc = new System.Xml.XmlDocument();

System.Xml.XmlElement elBatch = xmlDoc.CreateElement("Batch");

elBatch.SetAttribute("OnError", "Continue");

elBatch.SetAttribute("ListVersion", "1");


elBatch.InnerXml = xmlconst;

XmlNode ndReturn = listProxy.UpdateListItems(strListName, elBatch);

string result = ndReturn.OuterXml.ToString();
Page.RegisterClientScriptBlock("alert", "");
txtCreateSubFolder.Text = "";
}
}