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diff --git a/tools/NUnit/samples/csharp/money/IMoney.cs b/tools/NUnit/samples/csharp/money/IMoney.cs
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+// ****************************************************************
+// This is free software licensed under the NUnit license. You
+// may obtain a copy of the license as well as information regarding
+// copyright ownership at http://nunit.org/?p=license&r=2.4.
+// ****************************************************************
+
+namespace NUnit.Samples.Money 
+{
+
+	/// <summary>The common interface for simple Monies and MoneyBags.</summary>
+	interface IMoney 
+	{
+
+		/// <summary>Adds a money to this money.</summary>
+		IMoney Add(IMoney m);
+
+		/// <summary>Adds a simple Money to this money. This is a helper method for
+		/// implementing double dispatch.</summary>
+		IMoney AddMoney(Money m);
+
+		/// <summary>Adds a MoneyBag to this money. This is a helper method for
+		/// implementing double dispatch.</summary>
+		IMoney AddMoneyBag(MoneyBag s);
+
+		/// <value>True if this money is zero.</value>
+		bool IsZero { get; }
+
+		/// <summary>Multiplies a money by the given factor.</summary>
+		IMoney Multiply(int factor);
+
+		/// <summary>Negates this money.</summary>
+		IMoney Negate();
+
+		/// <summary>Subtracts a money from this money.</summary>
+		IMoney Subtract(IMoney m);
+	}
+}