ASP.NET

private void ExportToZip()
       {
           Response.Clear();
           //Response.BufferOutput = false;
           Response.ContentType = "application/zip";
           Response.AddHeader("content-disposition", "filename=\"PnLBudgetExport.zip\"");

           using (ZipFile zip = new ZipFile())
           {
               if (Directory.Exists(Server.MapPath(ZIP_FOLDER)))
               {
                   foreach (string file in Directory.GetFiles(Server.MapPath(ZIP_FOLDER)))
                   {
                       zip.CompressionMethod = CompressionMethod.None;
                       //int indx = file.LastIndexOf("\\");
                       //zip.AddEntry(file.Substring(indx), File.ReadAllBytes(file));
                       zip.AddFile(file, string.Empty);
                   }
               }

               zip.Save(Response.OutputStream);


           }
           DeleteTempDir();
       }

<asp:TextBox ID="txtPhone" runat="server" Width="100%"></asp:TextBox>

                    <cc1:MaskedEditExtender runat="server"  ID="mee" Mask="(999) 999-9999"
        TargetControlID="txtPhone"></cc1:MaskedEditExtender>