SharePointList Problem Please Help Me!

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C#3.0

C#

C#4.0

SharePoint

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public void Button1_Click(object sender, EventArgs e)
       {
           SPWeb mySite = SPContext.Current.Web;
           SPListItemCollection listItems = mySite.Lists["doneee"].Items;
           SPListItem item = listItems.Add();

           item.Update();
       }
       void documentAttachmentInSPList(SPListItem item)
       {
           SPListItem spListItem = item;
           string LISTNAME = spListItem.ParentList.Title;
           if (!string.IsNullOrEmpty(fileupload.FileName))
           {
               string fileExtension = fileupload.FileName.Substring(fileupload.FileName.IndexOf("*"));
               for (int i = 0; i < spListItem.Attachments.Count; i++)
               {
                   if ((spListItem.Attachments[i] != null)
                    && (spListItem.Attachments[i].Equals("FILENAME" + fileExtension)))
                   {
                       spListItem.Attachments.Delete("FILENAME" + fileExtension);
                       break;

                   }
               }
               spListItem.Attachments.Add("FILENAME" + fileExtension, fileupload.FileBytes);
               string attachmentURL = Request.Url.Scheme + "://" + Request.Url.Authority
               + "/Lists/" + LISTNAME + "/Attachments/" + spListItem.ID + "/";
               spListItem["Attached File"] = attachmentURL + "FILENAME" + fileExtension + ", View FILE";


           }

I created a button and fileupload control so that when i browse the file and click on button file should go intot the customlist.By using above code i am not able to upload file.