diff --git a/00_Common/dotnet/Games.Common.Test/IO/TokenReaderTests.cs b/00_Common/dotnet/Games.Common.Test/IO/TokenReaderTests.cs
index 3a4b9e9b..65b33908 100644
--- a/00_Common/dotnet/Games.Common.Test/IO/TokenReaderTests.cs
+++ b/00_Common/dotnet/Games.Common.Test/IO/TokenReaderTests.cs
@@ -6,14 +6,12 @@ using FluentAssertions.Execution;
 using Xunit;
 
 using static System.Environment;
+using static Games.Common.IO.Strings;
 
 namespace Games.Common.IO
 {
     public class TokenReaderTests
     {
-        const string NumberExpected = "!Number expected - retry input line";
-        const string ExtraInput = "!Extra input ignored";
-
         private readonly StringWriter _outputWriter;
 
         public TokenReaderTests()
diff --git a/00_Common/dotnet/Games.Common/IO/Strings.cs b/00_Common/dotnet/Games.Common/IO/Strings.cs
new file mode 100644
index 00000000..3d955409
--- /dev/null
+++ b/00_Common/dotnet/Games.Common/IO/Strings.cs
@@ -0,0 +1,8 @@
+namespace Games.Common.IO
+{
+    internal static class Strings
+    {
+        internal const string NumberExpected = "!Number expected - retry input line";
+        internal const string ExtraInput = "!Extra input ignored";
+    }
+}
\ No newline at end of file
diff --git a/00_Common/dotnet/Games.Common/IO/TokenReader.cs b/00_Common/dotnet/Games.Common/IO/TokenReader.cs
index f2046dc3..b7eb3774 100644
--- a/00_Common/dotnet/Games.Common/IO/TokenReader.cs
+++ b/00_Common/dotnet/Games.Common/IO/TokenReader.cs
@@ -1,13 +1,12 @@
 using System;
 using System.Collections.Generic;
 
+using static Games.Common.IO.Strings;
+
 namespace Games.Common.IO
 {
     internal class TokenReader
     {
-        private const string NumberExpected = "!Number expected - retry input line";
-        private const string ExtraInput = "!Extra input ignored";
-
         private readonly TextIO _io;
         private readonly Predicate<Token> _isTokenValid;