Programmatically create a Attachment functionality in Custom Visual WebPart Sharepoint 2010

i modified it to suit my requirement

paste this code in the .aspx  page

<table> <tr><td>

<asp:HiddenField Value="hDeleteAttachs" ID="hHiddenFields"  runat="server" />

</td></tr>

<tr>

<td><span id="part1">

<SharePoint:AttachmentButton runat="server" ID="btnAttach" ControlMode="new" Text="Add Attachment">

</SharePoint:AttachmentButton> </span></td></tr>

<tr><td id='idAttachmentsRow'>

<SharePoint:AttachmentUpload runat="server" ID="uploadAttach" ControlMode="New">

</SharePoint:AttachmentUpload></td></tr>

<tr><td><SharePoint:AttachmentsField runat="server" ID="fieldAttach" ControlMode="new" FieldName="Attachments">

</SharePoint:AttachmentsField></td></tr>

</table>

 <asp:Button ID="submitButton" runat="server" Text="Submit" OnClick="submitButton_Click" />

Below in the c# page

namespace ProjectName.VisualWebPartName

{

    public partial class VisualWebPartNameUserControl: UserControl

    {

        SPSite Osite = null;

        SPWeb Oweb = null;

        SPSite noprevsite = null;

        SPWeb noprevweb = null;

        SPList Olist = null;

        SPListItem Osplistitem = null;

 protected void Page_Load(object sender, EventArgs e)

        {

             noprevsite = SPContext.Current.Site;

             noprevweb = noprevsite.OpenWeb();

            SPSecurity.RunWithElevatedPrivileges(delegate()

            {

                Osite = new SPSite(noprevsite.ID);

                Oweb = Osite.OpenWeb(noprevweb.ID);

                Oweb.AllowUnsafeUpdates = true;

                Olist = Oweb.Lists["ListName"];

                btnAttach.ListId = Olist.ID;

                uploadAttach.ListId = Olist.ID;

                fieldAttach.ListId = Olist.ID;

                Osplistitem = Olist.Items.Add();

});

}

 protected void submitButton_Click(object sender, EventArgs e)

        {

          AddAttachments(ref Osplistitem);

        }

   void AddAttachments(ref SPListItem Osplistitem)

        {

            try

            {

                for (int i = 0; i < (Page.Request.Files.Count - 1); i++)

                {

                    try

                    {

                        //Get the list of files for attachments

                        HttpPostedFile newAttach = Page.Request.Files[i];

                        byte[] fileContents = new byte[newAttach.ContentLength - 1];

                        newAttach.InputStream.Seek(0, System.IO.SeekOrigin.Begin);

                        newAttach.InputStream.Read(fileContents, 0, newAttach.ContentLength - 1);

                        System.IO.FileInfo fInfo = new System.IO.FileInfo(newAttach.FileName);

                        Osplistitem.Attachments.Add(fInfo.Name, fileContents);

                    }

                    catch { continue; }

                }

            }

            catch

            {

            }

        }

}

}