protected void Page_Load(object sender, EventArgs e)
 {
     MyService.UserWebService uws = new UserWebService();
     uws.Credentials = System.Net.CredentialCache.DefaultCredentials;
     String[] id = uws.getNonRegisteredProfessorId();
     DropDownList2.DataSource = id;
     DropDownList2.DataBind();
 }