Check if filename is correct

Question

hey guys,
when I upload a file using my bsp page, I need to check if the filename is correct,
right now I have the following code:
num_multiparts = request->num_multiparts( ).
    while i <= num_multiparts.
      entity = request->get_multipart( i ).
      value = entity->get_header_field( '~content_filename' ).
      if not value is initial.
      found a file!
        navigation->set_parameter( name  = 'content_filename'
                                   value = value ).
I try to check the filename as follows, but this doesn't work:
        filenamecheck = navigation->get_parameter( name  = 'content_filename').
        if filenamecheck ne 'RU_BRA_PRO.CSV' .
        navigation->goto_page( 'select_country.htm' ).
        endif.

Answer 1

It should be as simple like that, but in some way, it just loops over this. It makes no difference if my value is correct or not, it just ignores the navigation->goto_page( 'select_country.htm' ). , no mather if the IF-condition is true or not...
here is my full code... this BSP is bugging me like hell
event handler for checking and processing user input and
for defining navigation
file upload and echo
    data: entity         type ref to if_http_entity,
          file           type string,
          filenamecheck type string,
          content_type   type string,
      content_length        type string,
          num_multiparts type i,
          i              type i value 1,
          doEcho         type string,
          value          type string.
  find multipart containing file
    num_multiparts = request->num_multiparts( ).
    while i <= num_multiparts.
      entity = request->get_multipart( i ).
      filenamecheck = entity->get_header_field( '~content_filename' ). 
      value = entity->get_header_field( '~content_filename' ).
      if not value is initial.
      found a file!
        navigation->set_parameter( name  = 'content_filename'
                                   value = value ).
        content_type = entity->get_header_field( 'Content-Type' ).
        navigation->set_parameter( name  = 'content_type'
            value = content_type ).
      get file content
        file = entity->get_cdata( ).
      get file size
       content_length = xstrlen( file ).
        navigation->set_parameter( name  = 'content_length'
            value = content_length ).
                                                                                TRANSLATE filenamecheck TO UPPER CASE.
        if file_name ne 'RU_BRA_PRO.CSV' .
        navigation->goto_page( 'select_country.htm' ).
        endif.                                                                               
data: data_TAB type table of string, LIN TYPE LINE,fname type string.
        split file at CL_ABAP_CHAR_UTILITIES=>CR_LF into table data_TAB.
        fname = '/usr/sap/CBD/DVEBMGS03/data/RU_BRA_PRO.CSV'.
        OPEN DATASET fname FOR OUTPUT in TEXT MODE encoding default.
        if sy-subrc gt 0.
          WRITE: / 'Error opening file'.
        endif.
        LOOP AT data_TAB INTO LIN.
          TRANSFER LIN TO FNAME.
        ENDLOOP.
        CLOSE DATASET FNAME.
        exit.
      endif.
      i = i + 1.
    endwhile.
    if doEcho is not initial.
      signal to the BSP runtime that the response data is
      complete and no onLayout method should be called to
      create the response
      navigation->response_complete( ).
    else.
      navigation->goto_page( 'end_upload.htm' ).
    endif.