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DataDisplay/DataSource/DataSourceExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DataDisplay.DataSource
+{
+	public static class DataSourceExtensions
+	{
+		public static CompositeDataSource Join(this IPointDataSource ds1, IPointDataSource ds2)
+		{
+			return new CompositeDataSource(ds1, ds2);
+		}
+  }
+}