diff --git a/td/generate/tl_writer_dotnet.h b/td/generate/tl_writer_dotnet.h
index 8228fa23..d6f6f3d9 100644
--- a/td/generate/tl_writer_dotnet.h
+++ b/td/generate/tl_writer_dotnet.h
@@ -376,7 +376,8 @@ class TlWriterDotNet : public TL_writer {
       } else {
         ss << ", ";
       }
-      ss << (gen_field_type(it) == "Array<byte>^" ? "Bytes" : "") << "FromUnmanaged(from." << gen_native_field_name(it.name) << ")";
+      bool need_bytes = gen_field_type(it) == "Array<byte>^" || gen_field_type(it) == "Array<Array<byte>^>^";
+      ss << (need_bytes ? "Bytes" : "") << "FromUnmanaged(from." << gen_native_field_name(it.name) << ")";
     }
     ss << ");\n}\n";
   }
diff --git a/td/tl/tl_dotnet_object.h b/td/tl/tl_dotnet_object.h
index 57b18b22..d81420a2 100644
--- a/td/tl/tl_dotnet_object.h
+++ b/td/tl/tl_dotnet_object.h
@@ -82,6 +82,16 @@ auto CLRCALL FromUnmanaged(std::vector<FromT> &vec) {
   return res;
 }
 
+inline auto CLRCALL BytesFromUnmanaged(const std::vector<std::string> &vec) {
+  using ToT = decltype(BytesFromUnmanaged(vec[0]));
+  Array<ToT>^ res = REF_NEW Vector<ToT>(static_cast<ArrayIndexType>(vec.size()));
+  ArrayIndexType i = 0;
+  for (auto &from : vec) {
+    ArraySet(res, i++, BytesFromUnmanaged(from));
+  }
+  return res;
+}
+
 template <class T>
 auto CLRCALL FromUnmanaged(td::td_api::object_ptr<T> &from) -> decltype(FromUnmanaged(*from.get())) {
   if (!from) {