diff --git a/td/generate/DotnetTlDocumentationGenerator.php b/td/generate/DotnetTlDocumentationGenerator.php
index d32492c8..674cbe13 100644
--- a/td/generate/DotnetTlDocumentationGenerator.php
+++ b/td/generate/DotnetTlDocumentationGenerator.php
@@ -54,7 +54,7 @@ class DotnetTlDocumentationGenerator extends TlDocumentationGenerator
             case 'string':
                 return 'String^';
             case 'bytes':
-                return 'Array<byte>^';
+                return 'Array<BYTE>^';
             case 'bool':
             case 'int':
             case 'long':
@@ -210,7 +210,7 @@ EOT
             while (substr($field_type, $pos, 6) === 'Array<') {
                 $pos += 6;
             }
-            if (substr($field_type, $pos, 6) !== 'String' && ucfirst(substr($field_type, $pos)) === substr($field_type, $pos)) {
+            if (substr($field_type, $pos, 4) !== 'BYTE' && substr($field_type, $pos, 6) !== 'String' && ucfirst(substr($field_type, $pos)) === substr($field_type, $pos)) {
                 $field_type = substr($field_type, 0, $pos).'::Telegram::Td::Api::'.substr($field_type, $pos);
             }
             $full_constructor .= $colon.$field_type.' '.$this->getParameterName($name, $class_name);
diff --git a/td/generate/tl_writer_dotnet.h b/td/generate/tl_writer_dotnet.h
index 276f4ba3..01295805 100644
--- a/td/generate/tl_writer_dotnet.h
+++ b/td/generate/tl_writer_dotnet.h
@@ -158,7 +158,7 @@ class TlWriterDotNet : public TL_writer {
       return "String^";
     }
     if (name == "Bytes") {
-      return "Array<byte>^";
+      return "Array<BYTE>^";
     }
 
     if (name == "Vector") {
@@ -288,7 +288,8 @@ class TlWriterDotNet : public TL_writer {
     while (field_type.substr(pos, 6) == "Array<") {
       pos += 6;
     }
-    if (field_type.substr(pos, 6) != "String" && to_upper(field_type[pos]) == field_type[pos]) {
+    if (field_type.substr(pos, 4) != "BYTE" && field_type.substr(pos, 6) != "String" &&
+        to_upper(field_type[pos]) == field_type[pos]) {
       field_type = field_type.substr(0, pos) + "::Telegram::Td::Api::" + field_type.substr(pos);
     }
     ss << field_type << " " << to_camelCase(a.name);
@@ -383,7 +384,7 @@ class TlWriterDotNet : public TL_writer {
       } else {
         ss << ", ";
       }
-      bool need_bytes = gen_field_type(it) == "Array<byte>^" || gen_field_type(it) == "Array<Array<byte>^>^";
+      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 ea1c8366..a1afce34 100644
--- a/td/tl/tl_dotnet_object.h
+++ b/td/tl/tl_dotnet_object.h
@@ -63,7 +63,7 @@ inline String^ FromUnmanaged(const std::string &from) {
 }
 
 inline auto CLRCALL BytesFromUnmanaged(const std::string &from) {
-  Array<byte>^ res = REF_NEW Vector<byte>(static_cast<ArrayIndexType>(from.size()));
+  Array<BYTE>^ res = REF_NEW Vector<BYTE>(static_cast<ArrayIndexType>(from.size()));
   ArrayIndexType i = 0;
   for (auto b : from) {
     ArraySet(res, i++, b);
@@ -160,7 +160,7 @@ inline std::string ToUnmanaged(String ^from) {
   return string_to_unmanaged(from);
 }
 
-inline std::string ToUnmanaged(Array<byte>^ from) {
+inline std::string ToUnmanaged(Array<BYTE>^ from) {
   if (!from) {
     return std::string();
   }