Dear Ashish Sahay ,

can you please point out where is the problem in codes.

Following Javascript to call ajax callback process.

apex.server.process("bank_payment_mst", {
    pageItems: "#P17_DATE,#P17_PROOF1",
    x01: $v(P17_DATE),
    x02: $v(P17_PROOF1)

},
    {
        success: function (pData) {
            // Codes in Case of Success
            apex.item('P17_VNUMBER').setValue(pData.vno);

        },
        error: function( jqXHR, textStatus, errorThrown ) {
            // Codes in Case of Error

    }
});
following is ajax callback process.

declare
    mid int;
   l_proof1 blob;
begin
    select nvl(max(mid),0)+1 into mid from voucher_mst;
    SELECT blob_content
        INTO l_proof1
        FROM apex_application_temp_files
        WHERE NAME = apex_application.g_x02;
    insert into voucher_mst values(mid,apex_application.g_x01,apex_application.g_x02);

   apex_json.open_object;
        apex_json.write('mid', mid);
   apex_json.close_all;
exception when no_data_found then
    raise_application_error(-20111,'problem saving ');
end;
following is error in console.

Error: Ajax call returned server error ORA-01403: no data found for 
.

thanks. this procedure is to convert blob in table to file.
In my case if I get file with file browser and when user press save button I want to change file name to voucher number just saved and save file on disk. I think for this purpose we don't need to save file into blob table and than convert to file. please guide me if I am wrong.