MQL4 Reference 
Trading functions OrderDelete
| bool OrderDelete( |
int ticket, color Color=CLR_NONE) |
Deletes previously opened pending order.
If the function succeeds, the return value is true.
If the function fails, the return value is false.
To get the detailed error information, call GetLastError().
Parameters:
| ticket |
- |
Unique number of the order ticket. |
| Color |
- |
Color of the arrow on the chart. If the parameter is missing or has CLR_NONE value arrow will not be drawn on the chart. |
Sample:
if(Ask>var1)
{
OrderDelete(order_ticket);
return(0);
}
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