protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
AssignmentModelClass a = new AssignmentModelClass();
System.Web.HttpApplication _context;
_context = System.Web.HttpContext.Current.ApplicationInstance;
string _root = "";
_root = _context.Server.MapPath("~/");
DropDownList1.DataSource = a.getfolders(_root);
DropDownList1.DataBind();
}
}