From 762ed4368afa513ef468eac4cf16e4c91ff9b61a Mon Sep 17 00:00:00 2001
From: Chris Bacon <chrisbacon@google.com>
Date: Fri, 26 Feb 2016 12:44:10 +0000
Subject: [PATCH] Support for coreclr

Use .ToLowerInvariant, which is supported by coreclr
---
 src/csharp/Grpc.Core/Metadata.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/csharp/Grpc.Core/Metadata.cs b/src/csharp/Grpc.Core/Metadata.cs
index aa22f840d6c..52cef96f405 100644
--- a/src/csharp/Grpc.Core/Metadata.cs
+++ b/src/csharp/Grpc.Core/Metadata.cs
@@ -323,7 +323,7 @@ namespace Grpc.Core
 
             private static string NormalizeKey(string key)
             {
-                var normalized = GrpcPreconditions.CheckNotNull(key, "key").ToLower(CultureInfo.InvariantCulture);
+                var normalized = GrpcPreconditions.CheckNotNull(key, "key").ToLowerInvariant();
                 GrpcPreconditions.CheckArgument(ValidKeyRegex.IsMatch(normalized), 
                     "Metadata entry key not valid. Keys can only contain lowercase alphanumeric characters, underscores and hyphens.");
                 return normalized;