SharePoint add new attachment

private void AddNewAttachment(int NodeID)
{
try
{
SPList myList = SPContext.Current.Web.Lists["Item List"];
SPListItem myNewItem = myList.GetItemById(NodeID);
if (fileUpload.PostedFile != null && fileUpload.HasFile)
{
Stream fStream = fileUpload.PostedFile.InputStream;
byte[] contents = new byte[fStream.Length];
fStream.Read(contents, 0, (int)fStream.Length);
fStream.Close();
fStream.Dispose();
SPAttachmentCollection attachments = myNewItem.Attachments;
string fileName = Path.GetFileName(fileUpload.PostedFile.FileName);
attachments.Add(fileName, contents);
myNewItem["Attached FileName"] = fileName; // store the name of the file in a column for future requirements
myNewItem.Update();
}
}
catch (Exception eAdd)
{
string errAdd = eAdd.Message;
}
}