File Attachment in Sandboxed Solution

Question

I was using below code to insert item in the list with the file attachement using farm solution
<asp:TextBox ID="txtBoxTitle" runat="server"></asp:TextBox>
<asp:FileUpload ID="flUpload" runat="server" />
<asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click"  />
in code behind
 protected void btnSave_Click(object sender, EventArgs e)
            try
                using (SPSite site = new SPSite(SPContext.Current.Site.OpenWeb().Url))
                    using (SPWeb web = site.OpenWeb())
                        SPList list = web.Lists["Test"];
                        SPListItem item = list.Items.Add();
                        item["Title"] = txtBoxTitle.Text;
                        AttachfileToListWithPrefix(item, flUpload, "", "Attachment1_");
                        item.Update();
            catch (Exception ex)
        public static void AttachfileToListWithPrefix(SPListItem item, FileUpload file, string fileName, string prefix)
            if (file.PostedFile != null && file.HasFile)
                if (file.PostedFile.ContentLength > 0)
                    if (fileName == "")
                        fileName = file.PostedFile.FileName;
                        fileName = fileName.Substring(fileName.LastIndexOf(@"\") + 1).Replace(@"\", "");
                    System.IO.Stream stream = file.PostedFile.InputStream;
                    byte[] contents = new byte[stream.Length];
                    stream.Read(contents, 0, (int)stream.Length);
                    stream.Close();
                    stream.Dispose();
                    //to identify each attachment with list item...because item might have 1 to 6 different attachment(s)
                    fileName = prefix + fileName;
                    //objAttchments.Add(fileName, byt);   
                    SPAttachmentCollection objAttchments = item.Attachments;
                    if (objAttchments.Count > 0)
                        for (int i = 0; i < objAttchments.Count; i++)
                            if (objAttchments[i].Contains(prefix))
                                objAttchments.Delete(objAttchments[i]);
                    objAttchments.Add(fileName, contents);
now i want to do the same thing in the sandboxed solution,but when  i try to do that it does not insert attachment in the list.
can anyone help how can i insert attachment through sandboxed solution??

Answer 1

can anyone help me on this??