1 files changed, 5 insertions, 1 deletions
diff --git a/samples/OAuthConsumer/App_Code/InMemoryTokenManager.cs b/samples/OAuthConsumer/App_Code/InMemoryTokenManager.cs
index f36a396..fede300 100644
--- a/samples/OAuthConsumer/App_Code/InMemoryTokenManager.cs
+++ b/samples/OAuthConsumer/App_Code/InMemoryTokenManager.cs
@@ -10,10 +10,14 @@ using System.Diagnostics;
 using DotNetOpenAuth.OAuth.ChannelElements;
 using DotNetOpenAuth.OAuth.Messages;
 
-public class InMemoryTokenManager : ITokenManager {
+public class InMemoryTokenManager : IConsumerTokenManager {
 	private Dictionary<string, string> tokensAndSecrets = new Dictionary<string, string>();
 
 	public InMemoryTokenManager(string consumerKey, string consumerSecret) {
+		if (String.IsNullOrEmpty(consumerKey)) {
+			throw new ArgumentNullException("consumerKey");
+		}
+
 		this.ConsumerKey = consumerKey;
 		this.ConsumerSecret = consumerSecret;
 	}