diff --git a/td/generate/DotnetTlDocumentationGenerator.php b/td/generate/DotnetTlDocumentationGenerator.php
index 7e11cc665..fd99c0c42 100644
--- a/td/generate/DotnetTlDocumentationGenerator.php
+++ b/td/generate/DotnetTlDocumentationGenerator.php
@@ -213,7 +213,7 @@ EOT
   /// </summary>
 EOT;
         foreach ($known_fields as $name => $type) {
-            $full_doc .= '\r\n  /// <param name="'.$this->getParameterName($name, $class_name).'">'.$info[$name]."</param>";
+            $full_doc .= "\r\n  /// <param name=\"".$this->getParameterName($name, $class_name).'">'.$info[$name]."</param>";
         }
         $this->addDocumentation($full_constructor, $full_doc);
     }
diff --git a/td/generate/tl_writer_dotnet.h b/td/generate/tl_writer_dotnet.h
index d6f6f3d90..011f4a390 100644
--- a/td/generate/tl_writer_dotnet.h
+++ b/td/generate/tl_writer_dotnet.h
@@ -527,9 +527,7 @@ class TlWriterDotNet : public TL_writer {
         return ss.str();
       }
       ss << "{\n";
-      ss << "  CallFromUnmanaged<" << class_name << "^> res;\n";
-      ss << "  downcast_call(from, res);\n";
-      ss << "  return CallFromUnmanagedRes<" << class_name << "^>::res;\n";
+      ss << "  return DoFromUnmanaged<" << class_name << "^>(from);\n";
       ss << "}\n";
     }
     return ss.str();
diff --git a/td/tl/tl_dotnet_object.h b/td/tl/tl_dotnet_object.h
index d81420a20..b60f28638 100644
--- a/td/tl/tl_dotnet_object.h
+++ b/td/tl/tl_dotnet_object.h
@@ -100,30 +100,21 @@ auto CLRCALL FromUnmanaged(td::td_api::object_ptr<T> &from) -> decltype(FromUnma
   return FromUnmanaged(*from.get());
 }
 
-template <class ResT>
-ref class CallFromUnmanagedRes {
-public:
-  static property ResT res;
-};
-
-template <class ResT>
-struct CallFromUnmanaged {
-  template <class T>
-  void operator()(T &val) const {
-    CallFromUnmanagedRes<ResT>::res = FromUnmanaged(val);
-  }
-};
+template <class ResT, class T>
+inline ResT DoFromUnmanaged(T &from) {
+  ResT res;
+  downcast_call(from, [&](auto &from_downcasted) {
+    res = FromUnmanaged(from_downcasted);
+  });
+  return res;
+}
 
 inline BaseObject^ FromUnmanaged(td::td_api::Function &from) {
-  CallFromUnmanaged<BaseObject^> res;
-  downcast_call(from, res);
-  return CallFromUnmanagedRes<BaseObject^>::res;
+  return DoFromUnmanaged<BaseObject^>(from);
 }
 
 inline BaseObject^ FromUnmanaged(td::td_api::Object &from) {
-  CallFromUnmanaged<BaseObject^> res;
-  downcast_call(from, res);
-  return CallFromUnmanagedRes<BaseObject^>::res;
+  return DoFromUnmanaged<BaseObject^>(from);
 }
 
 // to unmanaged