Using Sharepoint webservice (dws) ?

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C#

SharePoint

I am using dws (sharepoint service for documents ) but this code is not working. it gives error :-404 . while using CreateFolder what should i use as arrgument ?

try
            {
                Dws ds = new Dws();
                ds.Credentials = new NetworkCredential("Admin", "admin","test-06");
                ds.Url = "http://test-06/sites/backup/_vti_bin/Dws.asmx";
                ds.PreAuthenticate = true;
                string strResult = "";
                strResult = ds.CreateFolder("Shared%20Documents/NewFolderName");
                MessageBox.Show(strResult);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }