C#

public TreeNode GetTreeNode(string sNodeTag)
{
	TreeNode oRetVal = null;

	foreach (TreeNode oNode in treeView1.Nodes)
	{
		if ((string)oNode.Tag == sNodeTag)
		{
			oRetVal = oNode;
			break;
		}
	}

	return oRetVal;
}

public void SetActiveNode(string sNodeTag)
{
	foreach (TreeNode oNode in treeView1.Nodes)
	{
		if ((string)oNode.Tag == sNodeTag)
		{
			SelectedNode = oNode;
			break;
		}
	}
}

class SerachEbooksClass 
{
  public static List<ebook> GetEBooksByKeyWords (string [] keyWords, List<ebook> ebookList)
  {
     //..do some search stuff
  }
}
</ebook></ebook>

public int StringComparer(string stringA, string stringB)
{
    return stringA.CompareTo(stringB);
    // If the above doesn't do what you need then do what you like.
    // Must return -1, 0 or 1
}