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-rw-r--r--src/DotNetOpenAuth.OpenId.Provider/OpenId/Messages/CheckAuthenticationResponseProvider.cs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/DotNetOpenAuth.OpenId.Provider/OpenId/Messages/CheckAuthenticationResponseProvider.cs b/src/DotNetOpenAuth.OpenId.Provider/OpenId/Messages/CheckAuthenticationResponseProvider.cs
index 8f9a240..1e417e6 100644
--- a/src/DotNetOpenAuth.OpenId.Provider/OpenId/Messages/CheckAuthenticationResponseProvider.cs
+++ b/src/DotNetOpenAuth.OpenId.Provider/OpenId/Messages/CheckAuthenticationResponseProvider.cs
@@ -24,7 +24,7 @@ namespace DotNetOpenAuth.OpenId.Messages {
/// <param name="provider">The OpenID Provider that is preparing to send this response.</param>
internal CheckAuthenticationResponseProvider(CheckAuthenticationRequest request, OpenIdProvider provider)
: base(request.Version, request) {
- Contract.Requires<ArgumentNullException>(provider != null);
+ Requires.NotNull(provider, "provider");
// The channel's binding elements have already set the request's IsValid property
// appropriately. We just copy it into the response message.