diff --git a/MT5Connector/MT5Connector.cpp b/MT5Connector/MT5Connector.cpp
index d350c291..68dfe1f4 100755
--- a/MT5Connector/MT5Connector.cpp
+++ b/MT5Connector/MT5Connector.cpp
@@ -164,7 +164,7 @@ _DLLAPI int _stdcall sendStringResponse(int expertHandle, wchar_t* response, wch
 _DLLAPI int _stdcall sendVoidResponse(int expertHandle, wchar_t* err)
 {
     return Execute<int>([&expertHandle]() {
-        MtAdapter::GetInstance()->SendResponse(expertHandle, nullptr);
+        MtAdapter::GetInstance()->SendResponse(expertHandle, gcnew MtResponseObject(nullptr));
         return 1;
     }, err, 0);
 }
diff --git a/MtApi5/MqlBookInfo.cs b/MtApi5/MqlBookInfo.cs
index 5a3c1d87..d1e4be8e 100755
--- a/MtApi5/MqlBookInfo.cs
+++ b/MtApi5/MqlBookInfo.cs
@@ -10,13 +10,16 @@ namespace MtApi5
             this.volume = volume;
         }
 
-        public ENUM_BOOK_TYPE type { get; }    // Order type from ENUM_BOOK_TYPE enumeration
-        public double price { get; }           // Price
-        public long volume { get; }            // Volume
+        public MqlBookInfo()
+        { }
+
+        public ENUM_BOOK_TYPE type { get; set; }    // Order type from ENUM_BOOK_TYPE enumeration
+        public double price { get; set; }           // Price
+        public long volume { get; set; }            // Volume
 
         public override string ToString()
         {
-            return $"{type}|{price}|{volume}";
+            return $"type = {type}; price = {price}; volume = {volume}";
         }
     }
 }
diff --git a/MtApi5/MqlTradeCheckResult.cs b/MtApi5/MqlTradeCheckResult.cs
index 5b5f5cad..11d18e42 100755
--- a/MtApi5/MqlTradeCheckResult.cs
+++ b/MtApi5/MqlTradeCheckResult.cs
@@ -4,14 +4,14 @@ namespace MtApi5
 {
     public class MqlTradeCheckResult
     {
-        public uint Retcode { get; }               // Reply code
-        public double Balance { get; }             // Balance after the execution of the deal
-        public double Equity { get; }              // Equity after the execution of the deal
-        public double Profit { get; }              // Floating profit
-        public double Margin { get; }              // Margin requirements
-        public double Margin_free { get; }         // Free margin
-        public double Margin_level { get; }        // Margin level
-        public string Comment { get; }             // Comment to the reply code (description of the error)
+        public uint Retcode { get; set; }               // Reply code
+        public double Balance { get; set; }             // Balance after the execution of the deal
+        public double Equity { get; set; }              // Equity after the execution of the deal
+        public double Profit { get; set; }              // Floating profit
+        public double Margin { get; set; }              // Margin requirements
+        public double Margin_free { get; set; }         // Free margin
+        public double Margin_level { get; set; }        // Margin level
+        public string Comment { get; set; }             // Comment to the reply code (description of the error)
 
         public MqlTradeCheckResult(uint retcode
             , double balance
@@ -32,6 +32,9 @@ namespace MtApi5
             Comment = comment;
         }
 
+        public MqlTradeCheckResult()
+        { }
+
         public override string ToString()
         {
             return $"Retcode={Retcode}; Comment={Comment}; Balance={Balance}; Equity={Equity}; Profit={Profit}; Margin={Margin}; Margin_free={Margin_free}; Margin_level={Margin_level}";
diff --git a/MtApi5/Mt5CommandType.cs b/MtApi5/Mt5CommandType.cs
index a080d0a9..62f3dd5f 100755
--- a/MtApi5/Mt5CommandType.cs
+++ b/MtApi5/Mt5CommandType.cs
@@ -9,7 +9,6 @@ namespace MtApi5
         //OrderSend                           = 1,
         OrderCalcMargin                     = 2,
         OrderCalcProfit                     = 3,
-        //OrderCheck                          = 4,
         //OrderSendAsync                      = 5,
         PositionsTotal                      = 6,
         PositionGetSymbol                   = 7,
@@ -17,6 +16,7 @@ namespace MtApi5
         PositionGetDouble                   = 9,
         PositionGetInteger                  = 10,
         PositionGetString                   = 11,
+        PositionGetTicket                   = 4,
         OrdersTotal                         = 12,
         OrderGetTicket                      = 13,
         OrderSelect                         = 14,
@@ -107,8 +107,6 @@ namespace MtApi5
         BacktestingReady                    = 66,
         IsTesting                           = 67,
 
-        Print                               = 68,
-
         //Requests
         MtRequest                           = 155,
 
@@ -237,9 +235,24 @@ namespace MtApi5
         TerminalCompany = 68,
         TerminalName = 69,
         TerminalPath = 70,
-        TerminalInfoString = 153,
-        TerminalInfoInteger = 204,
-        TerminalInfoDouble = 205,
 
+        //Checkup
+        GetLastError                        = 132,
+        TerminalInfoString                  = 153, //TODO
+        TerminalInfoInteger                 = 204, //TODO
+        TerminalInfoDouble                  = 205, //TODO
+
+        //Common Functions
+        Alert                               = 136,  //TODO
+        Comment                             = 137,  //TODO
+        GetTickCount                        = 138,  //TODO
+        GetMicrosecondCount                 = 139,  //TODO
+        MessageBox                          = 140,  //TODO
+        PeriodSeconds                       = 141,  //TODO
+        PlaySound                           = 142,  //TODO
+        Print                               = 68,
+        ResetLastError                      = 143,
+        SendNotification                    = 144,  //TODO
+        SendMail                            = 145   //TODO
     }
 }
diff --git a/MtApi5/MtApi5Client.cs b/MtApi5/MtApi5Client.cs
index cadd5f92..c49ac754 100755
--- a/MtApi5/MtApi5Client.cs
+++ b/MtApi5/MtApi5Client.cs
@@ -280,6 +280,17 @@ namespace MtApi5
             return SendCommand<string>(Mt5CommandType.PositionGetString, commandParameters);
         }
 
+        ///<summary>
+        ///The function returns the ticket of a position with the specified index in the list of open positions and automatically selects the position to work with using functions PositionGetDouble, PositionGetInteger, PositionGetString.
+        ///</summary>
+        ///<param name="index">Identifier of a position property.</param>
+        public ulong PositionGetTicket(int index)
+        {
+            var commandParameters = new ArrayList { index };
+
+            return SendCommand<ulong>(Mt5CommandType.PositionGetTicket, commandParameters);
+        }
+
         ///<summary>
         ///Returns the number of current orders.
         ///</summary>
@@ -611,11 +622,11 @@ namespace MtApi5
         ///<param name="symbolName">Symbol name.</param>
         ///<param name="timeframe"> Period.</param>
         ///<param name="propId">Identifier of the requested property, value of the ENUM_SERIES_INFO_INTEGER enumeration.</param>
-        public int SeriesInfoInteger(string symbolName, ENUM_TIMEFRAMES timeframe, ENUM_SERIES_INFO_INTEGER propId)
+        public long SeriesInfoInteger(string symbolName, ENUM_TIMEFRAMES timeframe, ENUM_SERIES_INFO_INTEGER propId)
         {
             var commandParameters = new ArrayList { symbolName, (int)timeframe, (int)propId };
 
-            return SendCommand<int>(Mt5CommandType.SeriesInfoInteger, commandParameters);
+            return SendCommand<long>(Mt5CommandType.SeriesInfoInteger, commandParameters);
         }
 
         ///<summary>
@@ -3006,6 +3017,26 @@ namespace MtApi5
 
         #endregion //Date and Time
 
+        #region Checkup
+
+        ///<summary>
+        ///Returns the value of the last error that occurred during the execution of an mql5 program.
+        ///</summary>
+        public int GetLastError()
+        {
+            return SendCommand<int>(Mt5CommandType.GetLastError, null);
+        }
+
+        ///<summary>
+        ///Sets the value of the predefined variable _LastError into zero.
+        ///</summary>
+        public void ResetLastError()
+        {
+            SendCommand<object>(Mt5CommandType.ResetLastError, null);
+        }
+
+        #endregion
+
         #endregion // Public Methods
 
         #region Properties
diff --git a/MtApi5/Properties/AssemblyInfo.cs b/MtApi5/Properties/AssemblyInfo.cs
index 6c9ae86f..2eaad9a8 100755
--- a/MtApi5/Properties/AssemblyInfo.cs
+++ b/MtApi5/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.17")]
-[assembly: AssemblyFileVersion("1.0.17")]
+[assembly: AssemblyVersion("1.0.18")]
+[assembly: AssemblyFileVersion("1.0.18")]
diff --git a/TestClients/MtApi5TestClient/MainWindow.xaml b/TestClients/MtApi5TestClient/MainWindow.xaml
index deba1b3e..8420e45c 100755
--- a/TestClients/MtApi5TestClient/MainWindow.xaml
+++ b/TestClients/MtApi5TestClient/MainWindow.xaml
@@ -240,6 +240,7 @@
                             <StackPanel Orientation="Horizontal">
                                 <Button Content="OrderSend" Command="{Binding OrderSendCommand}" Width="100" Height="25" HorizontalAlignment="Left" Margin="4"/>
                                 <Button Content="OrderCheck" Command="{Binding OrderCheckCommand}" Width="100" Height="25" HorizontalAlignment="Left" Margin="4"/>
+                                <Button Content="PositionGetTicket" Command="{Binding PositionGetTicketCommand}" Width="100" Height="25" HorizontalAlignment="Left" Margin="4"/>
                             </StackPanel>
 
                             <WrapPanel>
@@ -293,15 +294,6 @@
                             Command="{Binding AccountInfoStringCommand}"
                             Content="AccountInfoString" HorizontalAlignment="Left" />
                     </Grid>
-                    <Grid Margin="10" Grid.Row="1">
-                        <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*"/>
-                            <ColumnDefinition Width="Auto"/>
-                        </Grid.ColumnDefinitions>
-                        
-                        <TextBox Grid.Column="0" Text="{Binding MessageText}" Margin="5"/>
-                        <Button Grid.Column="1" Content="Print" Command="{Binding PrintCommand}" Margin="5"/>
-                    </Grid>
                 </Grid>
             </TabItem>
 
@@ -438,6 +430,29 @@
                     <Button Command="{Binding TimeGMTCommand}" Content="TimeGMT" Margin="2"/>
                 </WrapPanel>
             </TabItem>
+
+            <TabItem Header="Checkup and Common Functions">
+                <Grid>
+                    <Grid.RowDefinitions>
+                        <RowDefinition Height="*" />
+                        <RowDefinition Height="Auto" />
+                    </Grid.RowDefinitions>
+
+                    <WrapPanel VerticalAlignment="Top" Margin="5">
+                        <Button Command="{Binding GetLastErrorCommand}" Content="GetLastError" Margin="2"/>
+                        <Button Command="{Binding ResetLastErrorCommand}" Content="ResetLastError" Margin="2"/>
+                    </WrapPanel>
+
+                    <Grid Margin="10" Grid.Row="1">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="*"/>
+                            <ColumnDefinition Width="Auto"/>
+                        </Grid.ColumnDefinitions>
+                        <TextBox Grid.Column="0" Text="{Binding MessageText}" Margin="5"/>
+                        <Button Grid.Column="1" Command="{Binding PrintCommand}" Content="Print" Margin="5"/>
+                    </Grid>
+                </Grid>
+            </TabItem>
         </TabControl>
 
         <Expander Grid.Row="2" Header="Console" IsExpanded="True">
diff --git a/TestClients/MtApi5TestClient/ViewModel.cs b/TestClients/MtApi5TestClient/ViewModel.cs
index fe2c3d25..7560ea90 100755
--- a/TestClients/MtApi5TestClient/ViewModel.cs
+++ b/TestClients/MtApi5TestClient/ViewModel.cs
@@ -20,6 +20,7 @@ namespace MtApi5TestClient
 
         public DelegateCommand OrderSendCommand { get; private set; }
         public DelegateCommand OrderCheckCommand { get; private set; }
+        public DelegateCommand PositionGetTicketCommand { get; private set; }
 
         public DelegateCommand HistoryOrderGetIntegerCommand { get; private set; }
         public DelegateCommand HistoryDealGetDoubleCommand { get; private set; }
@@ -61,6 +62,8 @@ namespace MtApi5TestClient
 
         public DelegateCommand PositionOpenCommand { get; private set; }
 
+        public DelegateCommand GetLastErrorCommand { get; private set; }
+        public DelegateCommand ResetLastErrorCommand { get; private set; }
         public DelegateCommand PrintCommand { get; private set; }
 
         public DelegateCommand iCustomCommand { get; private set; }
@@ -282,6 +285,7 @@ namespace MtApi5TestClient
 
             OrderSendCommand = new DelegateCommand(ExecuteOrderSend);
             OrderCheckCommand = new DelegateCommand(ExecuteOrderCheck);
+            PositionGetTicketCommand = new DelegateCommand(ExecutePositionGetTicket);
 
             HistoryOrderGetIntegerCommand = new DelegateCommand(ExecuteHistoryOrderGetInteger);
             HistoryDealGetDoubleCommand = new DelegateCommand(ExecuteHistoryDealGetDouble);
@@ -324,6 +328,8 @@ namespace MtApi5TestClient
             PositionOpenCommand = new DelegateCommand(ExecutePositionOpen);
 
             PrintCommand = new DelegateCommand(ExecutePrint);
+            GetLastErrorCommand = new DelegateCommand(ExecuteGetLastError);
+            ResetLastErrorCommand = new DelegateCommand(ExecuteResetLastError);
 
             iCustomCommand = new DelegateCommand(ExecuteICustom);
 
@@ -393,6 +399,19 @@ namespace MtApi5TestClient
             AddLog(message);
         }
 
+        private async void ExecutePositionGetTicket(object obj)
+        {
+            const int index = 0;
+            var retVal = await Execute(() =>
+            {
+                var ok = _mtApiClient.PositionGetTicket(index);
+                return ok;
+            });
+
+            var message = $"PositionGetTicket: result = {retVal}";
+            AddLog(message);
+        }
+
         private async void ExecuteHistoryOrderGetInteger(object o)
         {
             const ulong ticket = 12345;
@@ -984,6 +1003,18 @@ namespace MtApi5TestClient
             AddLog($"Print: message print in MetaTrader - {retVal}");
         }
 
+        private async void ExecuteGetLastError(object obj)
+        {
+            var retVal = await Execute(() => _mtApiClient.GetLastError());
+            AddLog($"GetLastError: last error = {retVal}");
+        }
+
+        private void ExecuteResetLastError(object obj)
+        {
+            _mtApiClient.ResetLastError();
+            AddLog("GetLastError: executed.");
+        }
+
         private async void ExecuteICustom(object o)
         {
             const string symbol = "EURUSD";
diff --git a/mq5/MtApi5.ex5 b/mq5/MtApi5.ex5
index 4db920c2..14774e8c 100755
Binary files a/mq5/MtApi5.ex5 and b/mq5/MtApi5.ex5 differ
diff --git a/mq5/MtApi5.mq5 b/mq5/MtApi5.mq5
index 84a7d3c2..9b553193 100755
--- a/mq5/MtApi5.mq5
+++ b/mq5/MtApi5.mq5
@@ -41,7 +41,7 @@
    bool getBooleanValue(int expertHandle, int paramIndex, bool& res, string& err);
 #import
 
-//#define __DEBUG_LOG__
+#define __DEBUG_LOG__
 
 input int Port = 8228;
 
@@ -282,7 +282,7 @@ int executeCommand()
       Execute_OrderCalcProfit();
    break;
    case 4: //OrderCheck
-      Execute_OrderCheck();
+      Execute_PositionGetTicket();
    break;
    case 6: //PositionsTotal
       Execute_PositionsTotal();
@@ -734,6 +734,14 @@ int executeCommand()
       Execute_TerminalInfoString();
    break;
 
+   
+   case 132: //GetLastError
+      Execute_GetLastError();
+   break;
+   case 143: //ResetLastError
+      Execute_ResetLastError();
+   break;
+   
    default:
       Print("Unknown command type = ", commandType);
       sendVoidResponse(ExpertHandle, _response_error);
@@ -743,6 +751,29 @@ int executeCommand()
    return (commandType);
 }
 
+//------ helper macros to get and send values ------------------
+
+#define GET_VALUE_OR_RETURN_WITH_SENDING_ERROR(get_func, argument_id, argument, cmd_name, param_name) if (!get_func(ExpertHandle, argument_id, argument, _error)) \
+   {                                                                                                                                                              \
+      PrintParamError(cmd_name, param_name, _error);                                                                                                              \
+      sendErrorResponse(ExpertHandle, -1, _error, _response_error);                                                                                               \
+      return;                                                                                                                                                     \
+   }                                                                                                                                                              \
+
+#define GET_INTEGER_VALUE(argument_id, argument, cmd_name, param_name) GET_VALUE_OR_RETURN_WITH_SENDING_ERROR(getIntValue, argument_id, argument, cmd_name, param_name)
+
+
+#define SEND_RESPONSE_OR_PRINT_ERROR(send_func, response, cmd_name) if (!send_func(ExpertHandle, response, _response_error)) \
+   {                                                                                                                         \
+      PrintResponseError(cmd_name, _response_error);                                                                         \
+   }
+
+#define SEND_INT_RESPONSE(response, cmd_name) SEND_RESPONSE_OR_PRINT_ERROR(sendIntResponse, response, cmd_name)
+#define SEND_LONG_RESPONSE(response, cmd_name) SEND_RESPONSE_OR_PRINT_ERROR(sendLongResponse, response, cmd_name)
+#define SEND_ULONG_RESPONSE(response, cmd_name) SEND_RESPONSE_OR_PRINT_ERROR(sendULongResponse, response, cmd_name)
+
+//-------------------------------------------------------------
+
 void Execute_Request()
 {
    string request;
@@ -909,19 +940,22 @@ void Execute_OrderCalcProfit()
    }
 }
 
-void Execute_OrderCheck()
+void Execute_PositionGetTicket()
 {
-   MqlTradeRequest request={0};      
-   ReadMqlTradeRequestFromCommand(request);
-   
-   MqlTradeCheckResult result={0};
-   
-   bool retVal = OrderCheck(request, result);
-         
-   if (!sendStringResponse(ExpertHandle, ResultToString(retVal, result), _response_error))
-   {
-      PrintResponseError("OrderCheck", _response_error);
-   }
+   int index;
+   GET_INTEGER_VALUE(0, index, "PositionGetTicket", "index");
+
+#ifdef __DEBUG_LOG__
+   PrintFormat("%s: index = %d", __FUNCTION__, index);
+#endif
+
+   ulong result = PositionGetTicket(index);
+
+#ifdef __DEBUG_LOG__
+   PrintFormat("%s: result = %u", __FUNCTION__, result);
+#endif
+
+   SEND_ULONG_RESPONSE(result, "PositionGetTicket");
 }
 
 void Execute_PositionsTotal()
@@ -5497,15 +5531,6 @@ void Execute_TimeGMT()
    }
 }
 
-#define GET_VALUE_OR_RETURN_WITH_SENDING_ERROR(get_func, argument_id, argument, cmd_name, param_name) if (!get_func(ExpertHandle, argument_id, argument, _error)) \
-   {                                                                                                                                                              \
-      PrintParamError(cmd_name, param_name, _error);                                                                                                              \
-      sendErrorResponse(ExpertHandle, -1, _error, _response_error);                                                                                               \
-      return;                                                                                                                                                     \
-   }                                                                                                                                                              \
-
-#define GET_INTEGER_VALUE(argument_id, argument, cmd_name, param_name) GET_VALUE_OR_RETURN_WITH_SENDING_ERROR(getIntValue, argument_id, argument, cmd_name, param_name)
-
 void Execute_IndicatorRelease()
 {
    int indicator_handle;
@@ -5520,6 +5545,31 @@ void Execute_IndicatorRelease()
       PrintResponseError("IndicatorRelease", _response_error);
    }
 }
+
+void Execute_GetLastError()
+{
+   int last_error = GetLastError();
+   
+#ifdef __DEBUG_LOG__
+   PrintFormat("%s: last_error = %d", __FUNCTION__, last_error);
+#endif
+
+   SEND_INT_RESPONSE(last_error, "GetLastError");
+}
+
+void Execute_ResetLastError()
+{
+   ResetLastError();
+   
+#ifdef __DEBUG_LOG__
+   PrintFormat("%s: called", __FUNCTION__);
+#endif
+   
+   if (!sendVoidResponse(ExpertHandle, _error))
+   {
+      PrintResponseError("ResetLastError", _response_error);
+   }
+}
    
 void PrintParamError(string paramName)
 {