using System;
using System.Collections;
using System.Collections.Generic;
 
namespace experiments
{
	class MainClass
	{
		public static void Main(string[] args)
		{
			C<int> c = new C<int>(1, 2, 3, 4, 5);
 
			Console.WriteLine("IEnumerable<T>:");
			foreach (int e in c)
			{				
				Console.WriteLine(e);
			}
			Console.WriteLine();
 
			Console.WriteLine("Implicit conversion to List<T>:");			
			foreach (int e in (List<int>)c)
			{
				Console.WriteLine(e);
			}
			Console.WriteLine();
 
			Console.WriteLine("Implicit conversion to T[]:");
			foreach (int e in (int[])c)
			{
				Console.WriteLine(e);
			}
		}
	}	
 
	class C<T> : IEnumerable<T> 		
	{		
		protected List<T> list;
 
		public C(params T[] elements)
		{		
			this.list = new List<T>();
 
			for (int i = 0; i < elements.Length; ++i)
			{
				this.list.Add(elements[i]);
			}
		}
 
		public IEnumerator<T> GetEnumerator() 
		{
			for (int i = this.list.Count - 1; i >= 0; --i)
			{
				yield return this.list[i];
			}
		}
 
		IEnumerator IEnumerable.GetEnumerator() 
		{
			return GetEnumerator();
		}
 
		public static implicit operator List<T>(C<T> c)
		{
			return new List<T>(c.list);
		}		
 
		public static implicit operator T[](C<T> c)
		{
			T[] arr = new T[c.list.Count];			
 
			if (c.list.Count > 0)
			{
				int j = 0;
 
				for (int i = c.list.Count / 2; i >= 0; --i)
				{
					arr[j++] = c.list[i];
				}
 
				for (int i = (c.list.Count / 2) + 1; i < c.list.Count; ++i)
				{
					arr[j++] = c.list[i];
				}
			}
 
			return arr;
		}		
	}
}

IEnumerable<T>:
5
4
3
2
1
 
Implicit conversion to List<T>:
1
2
3
4
5
 
Implicit conversion to T[]:
3
2
1
4
5

<soapenv:envelope
	xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
	xmlns="http://tews6/wsdl"
	xmlns:xsd="http://www.w3.org/2001/XMLSchema"
	xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://schemas.xmlsoap.org/soap/envelope/ http://schemas.xmlsoap.org/soap/envelope/">
	<soapenv:body>
		<soapenv:fault>
			<faultcode>soapenv:Client</faultcode>
			<faultstring>Error performing operation.</faultstring>
			<detail>
				<imsexception version="6.0">
					<exception>
						<name>CheckForDuplicates</name>
						<code>500</code>
						<description><!--[CDATA[User id johndoe is a duplicate. ProcessStep::BLTHValidate TabName:  ERRORLEVEL::Error]]--></description>
					</exception>
				</imsexception>
			</detail>
		</soapenv:fault>
	</soapenv:body>
</soapenv:envelope>

string a = null;
string b = "hello";
string c = a ?? b; // c equals "hello"

using System;
using System.Threading;
using System.Collections.Generic;
 
namespace Scienco
{
    class ThreadSafeQueue<T> 
        where T : class
    {
        private Queue<T> mQueue; 
        private Semaphore mSemaphore;
 
        public ThreadSafeQueue()
        {
            mQueue = new Queue<T>();
            mSemaphore = new Semaphore(0, int.MaxValue);
        }
 
        public void Enqueue(T element)
        {
            if (element == null)
            {
                throw new ArgumentNullException();
            }
 
            lock (this.mQueue) 
            {
                this.mQueue.Enqueue(element);
            }
 
            this.mSemaphore.Release();
        }
 
        public T Dequeue()
        {
            this.mSemaphore.WaitOne();
 
            lock (this.mQueue)
            {
                if (this.mQueue.Count > 0)
                {
                    return this.mQueue.Dequeue();
                }
 
                else
                {
                    return null;
                }
            }
        }
    }
}