C#

for(int i = 0; i < 4; i++)
{  
   for(int j = 0; j < 4; j++)
  {    
      Console.Write("#");
  }  
  Console.WriteLine();
}

Keshav Kamat
India

private List<Node> _nodes = new List<Node>();
public void AddNode(Node node)
{
  if (node != null)
  {
    _nodes.Add(node);
  }
}

public void AddNode(Node[] nodes)
{
  if (nodes != null && nodes.Length > 0)
  {
    _nodes.AddRange(nodes);
  }
}

List<Node> nodeCollection = new List<Node>();
...
// you hit the logic where you need to build a new node
Node newNode = new Node();
.. set unique values
.. use in unique processes
nodeCollection.Add( newNode );