C#

private void BuildModel(Node node, int currentLevel)
{
    //ModelLevel is the level the user wants to view
    if ((currentLevel + 1) > _modelLevel)
        return;

    currentLevel++;

    DataRow[] matchingRows = _relationshipDataSet.Tables[0].Select("[" + PARENT + "] = '" + node.Name + "'");
    if (matchingRows == null || matchingRows.Length == 0)
        return;

    foreach (DataRow row in matchingRows)
    {
        string childName = row[CHILD].ToString();

        //Node isnt in the current model, so create it
        string nodeHashCode = childName + node.Name + node.GetHashCode().ToString();
        if (!_graphNodeHashSet.Contains(nodeHashCode))
        {
            _graphNodeHashSet.Add(nodeHashCode);

            //Create node
            //....

            //Create the children of this node
            BuildModel(childNode, currentLevel);
        }
        else
        {
            //Node is in the current model, get it out of a local collection, and build its children
            List<node> nodeList = new List<node>();
            bool isValid = _nodeDictionary.TryGetValue(childName, out nodeList);
            if (isValid)
            {
                foreach (Node childNode in nodeList)
                {
                    //Create the children of this node
                    BuildModel(childNode, currentLevel);
                }
            }
        }
    }
}</node></node>

Gareth H wrote:

retrieves a tree structure