Help code mql4 for my EA

Hi,

I need your help for a part of my code. I want to open a new Long trade with 0.02lots once if the price falls about 50 pips, So I need to put ExistPositions0.02lots() FALSE first and put it TRUE when the new order with 0.02lots is opened.
How can I change this ExistPositions0.02lots() ?

bool ExistPositions0.02lots(){
for (int i=0; i<OrdersTotal(); i++) {
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES)) {
if (OrderSymbol()==Symbol() && OrderLots()==0.02) {
return(True);
}
}
}
return(False);
}

void DoublePositionBuy(int Perte1){
if (ExistPositions() && !ExistPositions0.02lots()){
for (int i=0; i<OrdersTotal(); i++) {
if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES)) {
if (OrderSymbol()==Symbol()) {
if (OrderType()==OP_BUY) {
if (OrderOpenPrice() - Ask > Point * Perte1){
OpenBuyDouble();

}
}
}
}
}
}
}

THANKS A LOT.
Goodgame42

I have a solution: I will use BuyLimit and SelLimit but is there anyone who tells me how can I close all pending orders WHEN the first trade is closed ?

Thanks a lot.

I found this code:

void DeleteThis_BUYSTOP(int MagicNumber) {
bool deleted;
for (int i = 0; i < OrdersTotal(); i++) {
OrderSelect(i, SELECT_BY_POS, MODE_TRADES);
while(IsTradeContextBusy()) Sleep(100);

if (OrderType() == OP_BUYSTOP && MagicNumber == OrderMagicNumber()
&& OrderSymbol() == Symbol() ) { deleted = OrderDelete(OrderTicket(), CLR_NONE);

if(deleted == false) {

Print("Error deleting buy stop order " + OrderTicket() + " Err#:" GetLastError());

}

}
}

But how can I use it when a trade of 0.01lot is closed ?