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diff --git a/samples/DotNetOpenAuth.ApplicationBlock/OAuthPrincipal.cs b/samples/DotNetOpenAuth.ApplicationBlock/OAuthPrincipal.cs
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+++ b/samples/DotNetOpenAuth.ApplicationBlock/OAuthPrincipal.cs
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+//-----------------------------------------------------------------------
+// <copyright file="OAuthPrincipal.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.ApplicationBlock {
+	using System;
+	using System.Linq;
+	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 OAuthPrincipal : IPrincipal {
+		/// <summary>
+		/// The roles this user belongs to.
+		/// </summary>
+		private string[] roles;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OAuthPrincipal"/> class.
+		/// </summary>
+		/// <param name="identity">The identity.</param>
+		/// <param name="roles">The roles this user belongs to.</param>
+		internal OAuthPrincipal(OAuthIdentity identity, string[] roles) {
+			this.Identity = identity;
+			this.roles = roles;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="OAuthPrincipal"/> class.
+		/// </summary>
+		/// <param name="username">The username.</param>
+		/// <param name="roles">The roles this user belongs to.</param>
+		internal OAuthPrincipal(string username, string[] roles)
+			: this(new OAuthIdentity(username), roles) {
+		}
+
+		#region IPrincipal Members
+
+		/// <summary>
+		/// Gets the identity of the current principal.
+		/// </summary>
+		/// <value></value>
+		/// <returns>
+		/// The <see cref="T:System.Security.Principal.IIdentity"/> object associated with the current principal.
+		/// </returns>
+		public IIdentity Identity { get; private set; }
+
+		/// <summary>
+		/// Determines whether the current principal belongs to the specified role.
+		/// </summary>
+		/// <param name="role">The name of the role for which to check membership.</param>
+		/// <returns>
+		/// true if the current principal is a member of the specified role; otherwise, false.
+		/// </returns>
+		public bool IsInRole(string role) {
+			return this.roles.Contains(role);
+		}
+
+		#endregion
+	}
+}