MQL4 Replace line in CSV file

So that can I save the important info to me from each trade, I made code to search for the ticket number (first column) while inside a for loop looking at all open orders. The purpose of this code is to try and over write one line in a CSV file with new information for that line/ticket. Once the ticket is closed, the line is no longer updated and contains the last info written. The problem is, it doesn't work. It adds lines instead of replacing lines. Does anyone know what I'm doing wrong or how to fix it? Thanks much in advance!

Kindest regards,

Don

FileSeek(TradeInfoHandle,0,SEEK_SET);
if(TradeInfoHandle > 0) {
   // Read From File
   int TicketNumberLength = StringLen(OrderTicket());
   while(FileTell(TradeInfoHandle) < FileSize(TradeInfoHandle)) {
      if(FileReadString(TradeInfoHandle) == IntegerToString(OrderTicket()) { 
         FileSeek(TradeInfoHandle,-TicketNumberLength,SEEK_CUR); 
      } else FileSeek(TradeInfoHandle,0,SEEK_END);
   }
   FileFlush(TradeInfoHandle);
}
if(TradeInfoHandle > 0) {   
   //Write To File
   string DataToWrite = StringConcatenate(
   IntegerToString(OrderTicket()),";",
   columns info to write, with each column separated by ,";",
   last column's info does not have ,";", after it
   );
   FileWrite(TradeInfoHandle, DataToWrite);
   FileFlush(TradeInfoHandle);
}