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-rw-r--r--src/DotNetOpenAuth.Core/Messaging/DataBag.cs4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/DotNetOpenAuth.Core/Messaging/DataBag.cs b/src/DotNetOpenAuth.Core/Messaging/DataBag.cs
index 0800840..8469676 100644
--- a/src/DotNetOpenAuth.Core/Messaging/DataBag.cs
+++ b/src/DotNetOpenAuth.Core/Messaging/DataBag.cs
@@ -8,7 +8,7 @@ namespace DotNetOpenAuth.Messaging {
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
- using System.Diagnostics.Contracts;
+ using Validation;
/// <summary>
/// A collection of message parts that will be serialized into a single string,
@@ -42,7 +42,7 @@ namespace DotNetOpenAuth.Messaging {
/// </summary>
/// <param name="version">The DataBag version.</param>
protected DataBag(Version version) {
- Contract.Requires(version != null);
+ Requires.NotNull(version, "version");
this.version = version;
}