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diff --git a/samples/DotNetOpenAuth.ApplicationBlock/OAuthIdentity.cs b/samples/DotNetOpenAuth.ApplicationBlock/OAuthIdentity.cs
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+++ b/samples/DotNetOpenAuth.ApplicationBlock/OAuthIdentity.cs
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+//-----------------------------------------------------------------------
+// <copyright file="OAuthIdentity.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.ApplicationBlock {
+	using System;
+	using System.Runtime.InteropServices;
+	using System.Security.Principal;
+
+	/// <summary>
+	/// Represents an OAuth consumer that is impersonating a known user on the system.
+	/// </summary>
+	[Serializable]
+	[ComVisible(true)]
+	internal class OAuthIdentity : IIdentity {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OAuthIdentity"/> class.
+		/// </summary>
+		/// <param name="username">The username.</param>
+		internal OAuthIdentity(string username) {
+			if (String.IsNullOrEmpty(username)) {
+				throw new ArgumentNullException("username");
+			}
+
+			this.Name = username;
+		}
+
+		#region IIdentity Members
+
+		/// <summary>
+		/// Gets the type of authentication used.
+		/// </summary>
+		/// <value>The constant "OAuth"</value>
+		/// <returns>
+		/// The type of authentication used to identify the user.
+		/// </returns>
+		public string AuthenticationType {
+			get { return "OAuth"; }
+		}
+
+		/// <summary>
+		/// Gets a value indicating whether the user has been authenticated.
+		/// </summary>
+		/// <value>The value <c>true</c></value>
+		/// <returns>true if the user was authenticated; otherwise, false.
+		/// </returns>
+		public bool IsAuthenticated {
+			get { return true; }
+		}
+
+		/// <summary>
+		/// Gets the name of the user who authorized the OAuth token the consumer is using for authorization.
+		/// </summary>
+		/// <returns>
+		/// The name of the user on whose behalf the code is running.
+		/// </returns>
+		public string Name { get; private set; }
+
+		#endregion
+	}
+}