Index: Ringtoets/Common/src/Ringtoets.Common.IO/Structures/ValidationResult.cs
===================================================================
diff -u -r6ef5e439a6d9f40ebd9926251945e0935fbbc314 -r61c2ac2573d82151b0b1593260a419543d07122a
--- Ringtoets/Common/src/Ringtoets.Common.IO/Structures/ValidationResult.cs	(.../ValidationResult.cs)	(revision 6ef5e439a6d9f40ebd9926251945e0935fbbc314)
+++ Ringtoets/Common/src/Ringtoets.Common.IO/Structures/ValidationResult.cs	(.../ValidationResult.cs)	(revision 61c2ac2573d82151b0b1593260a419543d07122a)
@@ -39,7 +39,7 @@
         /// <exception cref="ArgumentNullException">Thrown when <paramref name="errorMessages"/> is <c>null</c>.</exception>
         /// <exception cref="ArgumentException">Thrown when any message in <paramref name="errorMessages"/> is <c>null</c>, 
         /// empty or consists of whitespace.</exception>
-        public ValidationResult(ICollection<string> errorMessages)
+        public ValidationResult(IEnumerable<string> errorMessages)
         {
             if (errorMessages == null)
             {
@@ -50,7 +50,7 @@
                 throw new ArgumentException("Invalid error message string.");
             }
 
-            IsValid = errorMessages.Count < 1;
+            IsValid = !errorMessages.Any();
             this.errorMessages.AddRange(errorMessages);
         }