Initial data commit

Task/Flatten-a-list/C-sharp/flatten-a-list-1.cs

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+using System;
+using System.Collections;
+using System.Linq;
+
+namespace RosettaCodeTasks
+{
+	static class FlattenList
+	{
+		public static ArrayList Flatten(this ArrayList List)
+		{
+			ArrayList NewList = new ArrayList ( );
+
+			NewList.AddRange ( List );
+
+			while ( NewList.OfType<ArrayList> ( ).Count ( ) > 0 )
+			{
+				int index = NewList.IndexOf ( NewList.OfType<ArrayList> ( ).ElementAt ( 0 ) );
+				ArrayList Temp = (ArrayList)NewList[index];
+				NewList.RemoveAt ( index );
+				NewList.InsertRange ( index, Temp );
+			}
+			
+			return NewList;
+		}
+	}
+}

Task/Flatten-a-list/C-sharp/flatten-a-list-2.cs

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+using System;
+using System.Collections;
+
+namespace RosettaCodeTasks
+{
+	class Program
+	{
+		static void Main ( string[ ] args )
+		{
+
+			ArrayList Parent = new ArrayList ( );
+			Parent.Add ( new ArrayList ( ) );
+			((ArrayList)Parent[0]).Add ( 1 );
+			Parent.Add ( 2 );
+			Parent.Add ( new ArrayList ( ) );
+			( (ArrayList)Parent[2] ).Add ( new ArrayList ( ) );
+			( (ArrayList)( (ArrayList)Parent[2] )[0] ).Add ( 3 );
+			( (ArrayList)( (ArrayList)Parent[2] )[0] ).Add ( 4 );
+			( (ArrayList)Parent[2] ).Add ( 5 );
+			Parent.Add ( new ArrayList ( ) );
+			( (ArrayList)Parent[3] ).Add ( new ArrayList ( ) );
+			( (ArrayList)( (ArrayList)Parent[3] )[0] ).Add ( new ArrayList ( ) );
+			Parent.Add ( new ArrayList ( ) );
+			( (ArrayList)Parent[4] ).Add ( new ArrayList ( ) );
+			( (ArrayList)( (ArrayList)Parent[4] )[0] ).Add ( new ArrayList ( ) );
+
+			( (ArrayList)( (ArrayList)( (ArrayList)( (ArrayList)Parent[4] )[0] )[0] ) ).Add ( 6 );
+			Parent.Add ( 7 );
+			Parent.Add ( 8 );
+			Parent.Add ( new ArrayList ( ) );
+
+
+			foreach ( Object o in Parent.Flatten ( ) )
+			{
+				Console.WriteLine ( o.ToString ( ) );
+			}
+		}
+
+	}
+}

Task/Flatten-a-list/C-sharp/flatten-a-list-3.cs

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+	public static class Ex {
+		public static List<object> Flatten(this List<object> list) {
+
+			var result = new List<object>();
+			foreach (var item in list) {
+				if (item is List<object>) {
+					result.AddRange(Flatten(item as List<object>));
+				} else {
+					result.Add(item);
+				}
+			}
+			return result;
+		}
+		public static string Join<T>(this List<T> list, string glue) {
+			return string.Join(glue, list.Select(i => i.ToString()).ToArray());
+		}
+	}
+
+	class Program {
+
+		static void Main(string[] args) {
+			var list = new List<object>{new List<object>{1}, 2, new List<object>{new List<object>{3,4}, 5}, new List<object>{new List<object>{new List<object>{}}}, new List<object>{new List<object>{new List<object>{6}}}, 7, 8, new List<object>{}};
+
+			Console.WriteLine("[" + list.Flatten().Join(", ") + "]");
+			Console.ReadLine();
+		}
+	}