Writing data to a Text File

The below code is to write data from AX 2012 table to text file
static void WriteToTextFile(Args _args)
{
    TextIO file;
    Filename    filename = @"C:\TEMP\customers.txt";
    CustTable custTable;
    container con;
    FileIOPermission permission;
    #File
    try
    {
        //permission = new FileIOPermission(filename, #io_write);
        //permission.assert();
   
        file = new TextIo(filename, #io_write);
        if(file == null)
               throw Exception::Error;
        file.outRecordDelimiter(#delimiterCRLF);
        file.outFieldDelimiter(";");
   
        while select custTable
        {
            con = conNull();
            con = conIns(con,1,custTable.AccountNum);
            con = conIns(con,2,custTable.name());
            con = conIns(con,3,custTable.InvoiceAccount);
            con = conIns(con,4,custTable.CustGroup);
            file.writeExp(con);
        }
   
    }
    catch(exception::Error)
    {
        error("Can not access to write the file");
    }

    //CodeAccessPermission::revertAssert();

}