Create an Array List in C#
<p>I have got the problem with creating an array list in c#, Can you please help me.
I need to create the array list to remove all the pipes that have lengths lower than 19.</p>

<pre><code>namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            ArrayList lstPipeTypes = new ArrayList();

            lstPipeTypes.Add(new PipesList("PVC Pipes"));
            ((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The blue pipe", 12));
            ((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The red pipe", 15));
            ((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The silver pipe", 6));
            ((PipesList)lstPipeTypes[0]).Pipes.Add(new Pipe("The green pipe", 52));

            lstPipeTypes.Add(new PipesList("Iron Pipes"));
            ((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The gold pipe", 9));
            ((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The orange pipe", 115));
            ((PipesList)lstPipeTypes[1]).Pipes.Add(new Pipe("The pink pipe", 1));

            lstPipeTypes.Add(new PipesList("Chrome Pipes"));
            ((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The grey pipe", 12));
            ((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The black pipe", 15));
            ((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The white pipe", 19));
            ((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The brown pipe", 60));
            ((PipesList)lstPipeTypes[2]).Pipes.Add(new Pipe("The peach pipe", 16));


            RemoveTheSmallPipes(lstPipeTypes);
        }


        public static ArrayList RemoveTheSmallPipes(ArrayList lstPipeTypes)
        {

            //should remove all pipes that have lengths lower than 19.

            return lstPipeTypes;

        }
    }

    class PipesList
    {
        public string pipeType;
        public ArrayList Pipes;

        public PipesList(string newBoxType)
        {
            pipeType = newBoxType;
            Pipes = new ArrayList();
        }
    }

    class Pipe
    {
        public string name;
        public float length;

        public Pipe(string newName, float newLength)
        {
            this.name = newName;
            this.length = newLength;
        }
    }


}
</code></pre>

<p>I have created the two classes called Pipe and PipeList as well and I need to place the array list in the "RemoveTheSmallPipes" method. But I am confused now to write the rest. Please help me to remove all the pipes that have lengths lower than 19.</p>
