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MT5Account · Trading Operations - Overview

Place orders, modify positions, close trades, check orders, and calculate margin. Use this page to choose the right API for trading operations.

📁 What lives here

  • OrderSend - place market or pending orders (buy, sell, limit, stop, stop-limit).
  • OrderModify - modify existing orders or positions (price, SL, TP, expiration).
  • OrderClose - close positions (full or partial).
  • OrderCheck - validate order before sending (check margin, free margin, etc.).
  • OrderCalcMargin - calculate required margin for an order.

🧭 Plain English

  • OrderSend → the main trading method - opens positions, places pending orders.
  • OrderModify → change SL/TP levels, order prices, or expiration times.
  • OrderClose → close positions (with optional partial close).
  • OrderCheck → pre-flight check before sending order (validates margin, volume, etc.).
  • OrderCalcMargin → calculate how much margin you need before trading.

Rule of thumb: always use OrderCheckAsync or OrderCalcMarginAsync before sending large orders to avoid margin errors.

Quick choose

If you need… Use Returns Key inputs
Open position or place pending order OrderSendAsync OrderSendData (ticket, deal, code) Symbol, operation, volume, price, SL/TP
Modify existing order/position OrderModifyAsync Success code Ticket, new price, SL, TP, expiration
Close position (full or partial) OrderCloseAsync Success code Ticket, volume, slippage
Validate order before sending OrderCheckAsync Check result (margin, profit, errors) MqlTradeRequest object
Calculate required margin OrderCalcMarginAsync Margin value Symbol, order type, volume, price

❌ Cross‑refs & gotchas

  • OrderSend return code 10009 (TRADE_RETCODE_DONE) = success.
  • Slippage in points - set reasonable value (5-10 points typical).
  • Stop Loss/Take Profit must respect symbol's STOPLEVEL (minimum distance from price).
  • Volume must be within symbol's min/max lot size and step.
  • OrderCheck doesn't actually place order - just validates parameters.
  • Partial close - specify volume less than position size.
  • Expiration only works for TIME_SPECIFIED order type.

🟢 Minimal snippets

// Place market buy order
var request = new OrderSendRequest
{
    Symbol = "EURUSD",
    Operation = TMT5_ENUM_ORDER_TYPE.Tmt5OrderTypeBuy,
    Volume = 0.1,
    StopLoss = 1.08500,
    TakeProfit = 1.09500,
    Comment = "My trade"
};
var result = await account.OrderSendAsync(request);
if (result.ReturnedCode == 10009)
{
    Console.WriteLine($"✅ Order placed! Ticket: {result.Order}, Deal: {result.Deal}");
}
else
{
    Console.WriteLine($"❌ Error: {result.Comment}");
}

// Modify position - update SL/TP
var modifyResult = await account.OrderModifyAsync(new OrderModifyRequest
{
    Ticket = 123456789,
    StopLoss = 1.08000,
    TakeProfit = 1.10000
});
Console.WriteLine($"Modify result: {modifyResult.ReturnedCode}");

// Close position
var closeResult = await account.OrderCloseAsync(new OrderCloseRequest
{
    Ticket = 123456789,
    Volume = 0.1,  // Full volume
    Slippage = 10   // 10 points
});
Console.WriteLine($"Close result: {closeResult.ReturnedCode}");

// Check order before sending
var tradeRequest = new MrpcMqlTradeRequest
{
    Action = MRPC_ENUM_TRADE_REQUEST_ACTIONS.TradeActionDeal,
    Symbol = "EURUSD",
    Volume = 1.0,
    OrderType = ENUM_ORDER_TYPE_TF.OrderTypeTfBuy,
    Price = 1.09000
};
var checkResult = await account.OrderCheckAsync(new OrderCheckRequest
{
    MqlTradeRequest = tradeRequest
});
var checkData = checkResult.MqlTradeCheckResult;
Console.WriteLine($"Margin needed: ${checkData.Margin:F2}, Free margin after: ${checkData.FreeMargin:F2}");

// Calculate margin for 1 lot EURUSD
var marginData = await account.OrderCalcMarginAsync(
    symbol: "EURUSD",
    orderType: ENUM_ORDER_TYPE_TF.OrderTypeTfBuy,
    volume: 1.0,
    openPrice: 1.09000
);
Console.WriteLine($"Required margin: ${marginData.Margin:F2}");

See also