Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLineException.cs
===================================================================
diff -u -r3893 -r4000
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLineException.cs	(.../SurfaceLineException.cs)	(revision 3893)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SurfaceLineException.cs	(.../SurfaceLineException.cs)	(revision 4000)
@@ -19,12 +19,14 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System;
+
 namespace Deltares.DamEngine.Data.Geotechnics
 {
     /// <summary>
     /// Surface Line Exception
     /// </summary>
-    public class SurfaceLineException : System.Exception
+    public class SurfaceLineException : Exception
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="SurfaceLineException"/> class.