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    copied!<p>I have tested and written up a complete console program that should work. Here you go:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication3 { public interface ITest { int val {get; set; } List&lt;ITest&gt; Tests {get; set; } } public class Test1 : ITest { public int val { get; set; } public List&lt;ITest&gt; Tests {get; set; } public Test1() { Tests = new List&lt;ITest&gt;(); } } public class Test2 : ITest { public int val { get; set; } public List&lt;ITest&gt; Tests {get; set; } public Test2() { Tests = new List&lt;ITest&gt;(); } } public class Test3 : ITest { public int val { get; set; } public List&lt;ITest&gt; Tests {get; set; } public Test3() { Tests = new List&lt;ITest&gt;(); } } public class Test4 : ITest { public int val { get; set; } public List&lt;ITest&gt; Tests { get { return new List&lt;ITest&gt;(); } set {} } } class Program { public static int GetMinVal(ITest initialTest, out ITest testWithMinVal) { int minVal = initialTest.val; testWithMinVal = initialTest; foreach (ITest t in initialTest.Tests) { if (t.val &lt; minVal) { minVal = GetMinVal(t, out testWithMinVal); } } return minVal; } static void Main(string[] args) { Random r = new Random(); Test1 test = new Test1(); test.val = r.Next(100); for (int i = 0; i &lt; 5; i++) { Test2 test2 = new Test2(); test2.val = r.Next(100); for (int j = 0; j &lt; 4; j++) { Test3 test3 = new Test3(); test3.val = r.Next(100); for (int k = 0; k &lt; 3; k++) { Test4 test4 = new Test4(); test4.val = r.Next(100); test3.Tests.Add(test4); } test2.Tests.Add(test3); } test.Tests.Add(test2); } ITest testA; int minVal = GetMinVal(test, out testA); Console.WriteLine(minVal); } } } </code></pre> <p>I hope this helps...</p>
 

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