diff --git a/Migration.Tool.Extensions/ClassMappings/ClassMappingSample.cs b/Migration.Tool.Extensions/ClassMappings/ClassMappingSample.cs
index 383f033d..16844d0f 100644
--- a/Migration.Tool.Extensions/ClassMappings/ClassMappingSample.cs
+++ b/Migration.Tool.Extensions/ClassMappings/ClassMappingSample.cs
@@ -170,14 +170,17 @@ public static IServiceCollection AddClassMergeExample(this IServiceCollection se
         startDate.ConvertFrom(sourceClassName2, "EventStartDateAsText", false,
             (v, context) =>
             {
-                if (context is ConvertorTreeNodeContext(var nodeGuid, var nodeSiteId, var documentId, var migratingFromVersionHistory))
+                switch (context)
                 {
-                    // here you can use available treenode context
-                }
-                else
-                {
-                    // no context is available (possibly when tool is extended with other conversion possibilities)
+                    case ConvertorTreeNodeContext treeNodeContext:
+                        // here you can use available treenode context
+                        // (var nodeGuid, int nodeSiteId, int? documentId, bool migratingFromVersionHistory) = treeNodeContext;
+                        break;
+                    default:
+                        // no context is available (possibly when tool is extended with other conversion possibilities)
+                        break;
                 }
+
                 return v?.ToString() is { } av && !string.IsNullOrWhiteSpace(av) ? DateTime.Parse(av) : null;
             });
         startDate.WithFieldPatch(f => f.Caption = "Event start date");
diff --git a/Migration.Tool.Extensions/README.md b/Migration.Tool.Extensions/README.md
index 6b2cf2b7..c23805e2 100644
--- a/Migration.Tool.Extensions/README.md
+++ b/Migration.Tool.Extensions/README.md
@@ -66,8 +66,21 @@ var startDate = m.BuildField("StartDate");
 startDate.SetFrom("_ET.Event1", "EventDateStart", true);
 // if needed use value conversion to adapt value
 startDate.ConvertFrom("_ET.Event2", "EventStartDateAsText", false,
-    v => v?.ToString() is { } av && !string.IsNullOrWhiteSpace(av) ? DateTime.Parse(av) : null
-);
+    (v, context) =>
+    {
+        switch (context)
+        {
+            case ConvertorTreeNodeContext treeNodeContext:
+                // here you can use available treenode context
+                // (var nodeGuid, int nodeSiteId, int? documentId, bool migratingFromVersionHistory) = treeNodeContext;
+                break;
+            default:
+                // no context is available (possibly when tool is extended with other conversion possibilities)
+                break;
+        }
+
+        return v?.ToString() is { } av && !string.IsNullOrWhiteSpace(av) ? DateTime.Parse(av) : null;
+    });
 startDate.WithFieldPatch(f => f.Caption = "Event start date");
 ```