Index: Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs
===================================================================
diff -u -rfea3332b5f7a5cea6b41de4a6368c1f1c2bf1282 -rdcd6469f6000957bc1604da8e92bd5ea09e43769
--- Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision fea3332b5f7a5cea6b41de4a6368c1f1c2bf1282)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Plugin/FileImporter/PipingSurfaceLinesCsvImporter.cs	(.../PipingSurfaceLinesCsvImporter.cs)	(revision dcd6469f6000957bc1604da8e92bd5ea09e43769)
@@ -24,6 +24,7 @@
 using System.Drawing;
 using System.IO;
 using System.Linq;
+
 using Core.Common.Base.Geometry;
 using Core.Common.Base.IO;
 using Core.Common.IO.Exceptions;
@@ -43,7 +44,7 @@
     /// <para><c>Id;X1;Y1;Z1;...(Xn;Yn;Zn)</c></para>
     /// <para>Where Xn;Yn;Zn form the n-th 3D point describing the geometry of the surface line.</para>
     /// </summary>
-    public class PipingSurfaceLinesCsvImporter : IFileImporter
+    public class PipingSurfaceLinesCsvImporter : FileImporterBase
     {
         private readonly ILog log;
         private bool shouldCancel;
@@ -54,39 +55,39 @@
             log = LogManager.GetLogger(GetType());
         }
 
-        public string Name
+        public override string Name
         {
             get
             {
                 return PipingFormsResources.PipingSurfaceLinesCollection_DisplayName;
             }
         }
 
-        public string Category
+        public override string Category
         {
             get
             {
                 return RingtoetsFormsResources.Ringtoets_Category;
             }
         }
 
-        public Bitmap Image
+        public override Bitmap Image
         {
             get
             {
                 return PipingFormsResources.PipingSurfaceLineIcon;
             }
         }
 
-        public Type SupportedItemType
+        public override Type SupportedItemType
         {
             get
             {
                 return typeof(ICollection<RingtoetsPipingSurfaceLine>);
             }
         }
 
-        public string FileFilter
+        public override string FileFilter
         {
             get
             {
@@ -95,17 +96,16 @@
             }
         }
 
-        public ProgressChangedDelegate ProgressChanged { get; set; }
+        public override ProgressChangedDelegate ProgressChanged { protected get; set; }
 
-        public void Cancel()
+        public override void Cancel()
         {
             shouldCancel = true;
         }
 
-        public bool Import(object targetItem, string filePath)
+        public override bool Import(object targetItem, string filePath)
         {
             var importSurfaceLinesResult = ReadPipingSurfaceLines(filePath);
-
             if (importSurfaceLinesResult.CriticalErrorOccurred)
             {
                 return false;