MQL4 - How to Close All Trade

 //---------------------------------  
 // Close All Trade  
 //--------------------------------  
 void CloseAllTrades()  
 {  
   //go through all open trades  
   for (int i=OrdersTotal(); i>=0;i--)  
   {  
    //select trade  
    if (OrderSelect(i, SELECT_BY_POS)==true)  
    {  
      //check if trade belongs to current chart  
      if(OrderSymbol()== Symbol())  
      {  
       bool Ans = OrderClose(OrderTicket(),OrderLots(), MarketInfo(OrderSymbol(), MODE_BID),5,Red);  
       if (Ans == true)  
       {  
       Print ("Order Close !");  
       }  
      }  
    }  
   }  
 }