Some name-breaking changes so master is now v3. V2 will continue to be the code on nuget for now.

NTwain/Triplets/TripletBase.cs

@@ -0,0 +1,30 @@
+using NTwain.Internals;
+using System;
+
+namespace NTwain.Triplets
+{
+	/// <summary>
+	/// Base class for grouping triplet operations messages.
+	/// </summary>
+	public abstract class TripletBase
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="TripletBase" /> class.
+		/// </summary>
+		/// <param name="session">The session.</param>
+		/// <exception cref="System.ArgumentNullException"></exception>
+        internal TripletBase(ITwainSessionInternal session)
+		{
+			if (session == null) { throw new ArgumentNullException("session"); }
+			Session = session;
+		}
+
+		/// <summary>
+		/// Gets the twain session.
+		/// </summary>
+		/// <value>
+		/// The session.
+		/// </value>
+        internal ITwainSessionInternal Session { get; private set; }
+	}
+}