Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Standard/UniqueNameProvider.cs
===================================================================
diff -u -r4052 -r4053
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Standard/UniqueNameProvider.cs	(.../UniqueNameProvider.cs)	(revision 4052)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Standard/UniqueNameProvider.cs	(.../UniqueNameProvider.cs)	(revision 4053)
@@ -61,7 +61,7 @@
             string newName = item.Name;
             while (NameExists(collection, item, newName))
             {
-                newName = newName.Replace(string.Format("({0})", indexer), string.Format("({0})", ++indexer));
+                newName = newName.Replace($"({indexer})", $"({++indexer})");
             }
 
             item.Name = newName;