Uploaded text file has a new line added at the top using BSP MVC applicatio

Question

I have a BSP MVC application that uploads data on to the application server. When I open the uploaded text file, the very first line on the file looks like the line below. ->
htmlb:button:click:nullhtmlb_form_1UploadUpload0htmlbdfsdf
But the rest of the file looks okay. This is causing other than .txt files to get corrupted.
Here is the code from my DO_HANDLE_EVENT.
data: entity   type ref to if_http_entity,
      name     type string,
      content  type xstring,
      content_type type string,
      idx      type i value 1,
      v_root(26) value '
houappl131\SRM_Download\',
      v_unxfile(100),
      v_transfer type xstring,
      v_type(6),
      v_len type i,
      v_dirfile type zfileinfo,
      v_ofile(80),
      v_guid type guid_32.
  class cl_htmlb_manager definition load.
  data:        v_asn(10) type n.
  data: fu        type ref to cl_htmlb_fileupload,
                   file_id   type string value 'batchfile'.
  data: o_page_context type ref to if_bsp_page_context.
  data: parent type ref to cl_bsp_controller2,
        lo_model                       type ref to cl_sus_m_asn_detail.
  o_page_context = me->get_page_context( ).
  cl_htmlb_manager=>dispatch_event_ex( request = request
  page_context = o_page_context
  event_handler = me ).
  refresh z_batch->message.
  if htmlb_event->server_event = 'Upload'.
    fu ?= cl_htmlb_manager=>get_data( request = request id = file_id name
                                         = 'fileUpload' ).
    if fu->file_name gt space.
          z_batch->parameters-fpath = fu->file_name.
          v_len = strlen( z_batch->parameters-fpath ).
          if v_len gt 4.
            v_len = v_len - 3.
          endif.
          v_type = z_batch->parameters-fpath+v_len(3).
          search z_batch->parameters-fpath for '.'.
          if sy-fdpos gt 0 and v_len gt 0.
            v_len = v_len - sy-fdpos.
            v_type = z_batch->parameters-fpath+sy-fdpos(v_len).
          endif.
          clear v_asn.
          v_asn = z_batch->parameters-asnhdr.
          concatenate v_asn
                      z_batch->parameters-asnitem
                      z_batch->parameters-batch
                      v_type
                      into v_unxfile separated by '.'.
          concatenate v_root v_unxfile into v_unxfile.
          condense v_unxfile no-gaps.
          open dataset v_unxfile for output in binary mode.
            while idx <= request->num_multiparts( ).
              entity = request->get_multipart( idx ).
              name = fu->file_name .
              if name is not initial.
                content_type = entity->get_header_field( 'Content-Type' ).
                clear content.
                content      = entity->get_data( ).
                v_transfer = content.
                transfer content to v_unxfile.
                append content to z_batch->filetab.
              endif.
              idx = idx + 1.
            endwhile.
            close dataset v_unxfile.
        endif.
  endif.
Here is my fileupload button in the view
<htmlb:page title="File Upload " >
    <htmlb:form method       = "post"
                encodingType = "multipart/form-data" >
      <htmlb:label id     = "Batchnum"
                   design = "Label"
                   for    = "Batchnumber"
                   text   = "Batch" />
      <htmlb:inputField id    = "Batchinput"
                        value = "//zbatch/parameters.batch" />
      <htmlb:fileUpload id="batchfile" />
      <htmlb:button id      = "Upload"
                    text    = "Upload"
                    onClick = "Upload" />
      <htmlb:button id      = "Close"
                    text    = "Close window"
                    onClick = "Close" />
Any of you gurus know why this is happening?

Answer 1

I solved it myself