Upload or download csv files

Hi folks,
How we can upload or download csv(comma separated vale) fles in web dynpro abap.in some forums i seen how we can upload or download files but i need file upload/download csv files

hi ,
create an attribute datasource of type xstring...and use the following code
TYPES :
       BEGIN OF STR_ITAB,
       AP_NUMBER(10) TYPE C,
       SPAN(10) TYPE C,
       TOWER_TYPE(10) TYPE C,
       END OF STR_ITAB.
       DATA : T_TABLE1 TYPE STANDARD TABLE OF STR_ITAB,
         I_DATA TYPE STANDARD TABLE OF STRING,
*         LO_ND_SFLIGHT TYPE REF TO IF_WD_CONTEXT_NODE,
*         LO_EL_SFLIGHT TYPE REF TO IF_WD_CONTEXT_ELEMENT,
         L_STRING TYPE STRING,
         FS_TABLE TYPE STR_ITAB,
         L_XSTRING TYPE XSTRING,
         FIELDS TYPE STRING_TABLE,
         LV_FIELD TYPE STRING.
          DATA : T_TABLE TYPE IF_ZWD_KT_TOWERSCHDUL_V=>ELEMENTS_CTX_VN_DATA_TAB,
          CTX_VN_DATA_TABLE TYPE IF_ZWD_KT_TOWERSCHDUL_V=>ELEMENTS_CTX_VN_DATA_TAB.
* get single attribute
WD_CONTEXT->GET_ATTRIBUTE( EXPORTING   NAME = `DATASOURCE`    IMPORTING   VALUE = L_XSTRING ).
CALL FUNCTION 'HR_KR_XSTRING_TO_STRING'
    EXPORTING
      IN_XSTRING = L_XSTRING
    IMPORTING
      OUT_STRING = L_STRING.
SPLIT L_STRING AT CL_ABAP_CHAR_UTILITIES=>CR_LF INTO TABLE I_DATA.
*SPLIT S_CONT AT CL_ABAP_CHAR_UTILITIES=> INTO TABLE S_TABLE.
FIELD-SYMBOLS: <WA_TABLE> LIKE LINE OF I_DATA.
REFRESH T_TABLE1.
CLEAR FS_TABLE.
DELETE I_DATA INDEX 1.
LOOP AT I_DATA ASSIGNING <WA_TABLE>.
* splits string on basis of tabs
SPLIT <WA_TABLE> AT ',' INTO
                  FS_TABLE-TOWER_TYPE
                  FS_TABLE-AP_NUMBER
                  FS_TABLE-SPAN.
APPEND FS_TABLE TO T_TABLE1.
*                  STR_ITAB-NUMBER_DIGITS.
* APPEND STR_ITAB TO ITAB.
ENDLOOP.
*       Bind With table Element.
*      LOOP AT i_data INTO l_string.
*    SPLIT l_string AT cl_abap_char_utilities=>horizontal_tab INTO TABLE fields.
*     READ TABLE fields INTO lv_field INDEX 1.
*    fs_table-AP_NUMBER = lv_field.
*     READ TABLE fields INTO lv_field INDEX 2.
*    fs_table-SPAN = lv_field.
*     APPEND fs_table TO t_table1.
* ENDLOOP.
* lo_nd_sflight = wd_context->get_child_node( 'CTX_VN_CTX_VN_CTX_VN_CTX_VN_DATA_TAB' ).
* lo_nd_sflight->bind_table( t_table1 ).
DATA LO_ND_CTX_VN_DATA_TAB TYPE REF TO IF_WD_CONTEXT_NODE.
DATA LO_EL_CTX_VN_DATA_TAB TYPE REF TO IF_WD_CONTEXT_ELEMENT.
DATA LS_CTX_VN_DATA_TAB TYPE WD_THIS->ELEMENT_CTX_VN_DATA_TAB.
* navigate from <CONTEXT> to <CTX_VN_CTX_VN_CTX_VN_CTX_VN_DATA_TAB> via lead selection
LO_ND_CTX_VN_DATA_TAB = WD_CONTEXT->GET_CHILD_NODE( NAME = WD_THIS->WDCTX_CTX_VN_DATA_TAB ).
LO_ND_CTX_VN_DATA_TAB->BIND_TABLE( T_TABLE1 ).
thanks and regards,
sahai.s

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