Zip file with DotnetZip library wihout sub foldfer.

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C#

C#4.0

ZIP

Dear all,

I'm currently using Dotnet 4.0 with VS 2010..
I want to test zip file using DotnetZip library.

this following is my coding :

using Ionic.Zip;

namespace testzip
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {           
            using (ZipFile zip = new ZipFile())
            {
                string inputdirectory = @"D:\BackUp\20130102.bak";
                string outputdirectory = @"D:\BackUp\20130102.ZIP";
                inputdirectory = inputdirectory.Replace("\\", "\\\\");
                outputdirectory = outputdirectory.Replace("\\", "\\\\");
                DirectoryInfo di = new DirectoryInfo(inputdirectory);
                zip.AddFile(inputdirectory);
                //zip.AddDirectory(inputdirectory, "ZipTest");
                zip.Comment = "This zip file is created using DotNetZip library";
                zip.Save(outputdirectory);
            }
        }

this code is working fine... I can zip my file name 20130102.bak successfully, but when i use Winzip or winrar to extract -> then choose extract here-> it not only extract my file, but also include sub folder name BackUp.
I want to zip and extract without sub folder, Please help me...