diff --git a/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs b/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
index 6ae0d53e..6b3b0b2b 100644
--- a/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
+++ b/dotnet/IEC61850forCSharp/IEC61850CommonAPI.cs
@@ -649,6 +649,21 @@ namespace IEC61850
 			NONE = -1
 		}
 
+        /// <summary>
+        /// Definition for LastAppError error type for control models
+        /// Used in LastApplError and CommandTermination messages.
+        /// </summary>
+        public enum ControlLastApplError {
+            NO_ERROR = 0,
+            UNKNOWN = 1,
+            TIMEOUT_TEST = 2,
+            OPERATOR_TEST = 3
+        }
+
+        /// <summary>
+        /// AddCause - additional cause information for control model errors
+        /// Used in LastApplError and CommandTermination messages.
+        /// </summary>
 		public enum ControlAddCause {
 			ADD_CAUSE_UNKNOWN = 0,
 			ADD_CAUSE_NOT_SUPPORTED = 1,
diff --git a/dotnet/IEC61850forCSharp/IEC61850ServerAPI.cs b/dotnet/IEC61850forCSharp/IEC61850ServerAPI.cs
index 90748455..0b7413e1 100644
--- a/dotnet/IEC61850forCSharp/IEC61850ServerAPI.cs
+++ b/dotnet/IEC61850forCSharp/IEC61850ServerAPI.cs
@@ -875,6 +875,9 @@ namespace IEC61850
             [DllImport ("iec61850", CallingConvention = CallingConvention.Cdecl)]
             static extern void ControlAction_setAddCause (IntPtr self, int addCause);
 
+            [DllImport("iec61850", CallingConvention = CallingConvention.Cdecl)]
+            static extern void ControlAction_setError(IntPtr self, int error);
+
             [DllImport ("iec61850", CallingConvention = CallingConvention.Cdecl)]
             static extern int ControlAction_getOrCat (IntPtr self);
 
@@ -905,6 +908,15 @@ namespace IEC61850
                 this.iedServer = iedServer;
             }
 
+            /// <summary>
+            /// Sets the error code for the next command termination or application error message.
+            /// </summary>
+            /// <param name="error">the errror code to use</param>
+            public void SetError(ControlLastApplError error)
+            {
+                ControlAction_setError(self, (int)error);
+            }
+
             /// <summary>
             /// Sets the add cause for the next command termination or application error message
             /// </summary>