Issue #32: Added function ChartRedraw

MtApi/MtApiClient.cs

@@ -1722,6 +1722,15 @@ namespace MtApi
         {
             return SendCommand<long>(MtCommandType.ChartId, null);
         }
+
+        ///<summary>
+        ///This function calls a forced redrawing of a specified chart.
+        ///</summary>
+        public void ChartRedraw(long chartId = 0)
+        {
+            var commandParameters = new ArrayList { chartId };
+            SendCommand<object>(MtCommandType.ChartRedraw, commandParameters);
+        }
         #endregion
 
         #region Private Methods
@@ -1872,6 +1881,11 @@ namespace MtApi
                 throw new MtExecutionException(MtErrorCode.MtApiCustomError, "Response from MetaTrader is null");
             }
 
+            if (response.ErrorCode != 0)
+            {
+                throw new MtExecutionException((MtErrorCode)response.ErrorCode, response.ToString());
+            }
+
             var responseValue = response.GetValue();
             return responseValue != null ? (T)responseValue : default(T);
         }

MtApi/MtCommandType.cs

@@ -197,6 +197,7 @@
         SymbolName                          = 201,
         SymbolSelect                        = 202,
         SymbolInfoInteger                   = 203,
-        ChartId                             = 206
+        ChartId                             = 206,
+        ChartRedraw                         = 207
     }
 }