File Upload using web service

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C#

Silverlight4

File-Upload

, +

I am using Web service to upload file from silverlight client. I managed to upload files successfully using below code[webservice] from same computer but i get error on uploading from network.

I tried fixes like setting file permissions to full, but none worked.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.IO;
using System.Web.Hosting;
using System.Security;

namespace SilverlightApplication5.Web
{
    [WebService(Namespace = "http://***.com/testfile/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    public class FileUploadService : System.Web.Services.WebService
    {
        [WebMethod]
        public string TestService()
        {
            return "Service test suceed";
        }

        [WebMethod]
        public string Upload(string id, string mode, string path, string name, string filedata, bool overwrite, string tag, bool final)
        {
            try
            {
                string filename = string.Empty;

                if (Directory.Exists(@HostingEnvironment.ApplicationPhysicalPath + "/Documents/" + path) == false)
                {
                    Directory.CreateDirectory(@HostingEnvironment.ApplicationPhysicalPath + "/Documents/" + path);
                }
                try
                {
                    filename = Server.MapPath("~") + @"\Documents\" + path.Replace("/", @"\") + @"\" + name;

                    if (mode == "new")
                    {
                        if (File.Exists(filename) == true)
                        {
                            if (overwrite)
                            {
                                File.Delete(filename);
                            }
                            else
                            {
                                return "File Already Exists";
                            }
                        }

                        WriteFile(filename, Convert.FromBase64String(filedata), FileMode.Create);
                    }
                    else
                    {
                        WriteFile(filename, Convert.FromBase64String(filedata), FileMode.Append);
                    }
                }
                catch (Exception ex)
                {
                    File.Delete(filename);
                    return "File Write Error: " + ex.Message;
                }

                return "ok";
            }
            catch (SecurityException ex)
            {
                return ex.Message.ToString();
            }
            catch (Exception ex)
            {
                return ex.Message.ToString();
            }
        }

        private void WriteFile(string filename, byte[] content, FileMode fileMode)
        {
            Stream target = null;
            BinaryWriter writer = null;

            try
            {
                target = File.Open(filename, fileMode);
                writer = new BinaryWriter(target);

                writer.Write(content);
            }
            catch (Exception ex)
            {
                throw new Exception("Could not write to file: " + filename + " - " + ex.Message);
            }
            finally
            {
                if (target != null)
                {
                    target.Close();
                }
                if (writer != null)
                {
                    writer.Close();
                }
            }
        }
    }
}

please tell me where i am doing wrong in hosting this service.
thanks in advance.