Help with webservice - uploading to SharePoint doc library with C#

Here's a webservice I'm having trouble with

<%@ WebService Language="C#" Class="UploadService.Files" %>

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using System.Data;
using System.IO;
using System.Web.Services;

 [WebService(Namespace = "Microsoft.SharePoint.Administration")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Files : System.Web.Services.WebService
    {

        [WebMethod]
        public string UploadDocument(string fileName, byte[] fileContents, string pathFolder)
        {
            if (fileContents == null)
            {
                return "Null Attachment";
            }
            try
            {

                SPSite site = SPContext.Current.Site;
                SPWeb web = site.OpenWeb();
                SPFolder folder = web.GetFolder(pathFolder);
                string fileURL = fileName;


                SPFile file = folder.Files.Add(fileURL, fileContents, true);
                return file.TimeCreated.ToLongDateString() + "::" + file.Title;

            }
            catch (System.Exception ex)
            {
                return ex.Message + "::" + ex.Source;
            }
        }

    }


It uploads files from a network drive to a SharePoint document library. It works great except that it won't overwrite existing files. I have versioning enabled on SharePoint as well. What do I need to do to get it to overwrite?


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