C#

LoadFolder( foldername )
{
    int totalsize

    add node

    totalsize += size of files in foldername

    for each sub folders in foldername 
    {
        totalsize += LoadFolder( subfolder )

        update new node text with totalsize

        need to process messages here
    }

    return totalsize
}
then you just need to call LoadFolder( "c:\" ) on you button once

NewNode.Text = "Node: " + i.ToString();

TreeNode NewNode;
for( int i = 0; i < 1000; i++ )
{    
    NewNode = treeView.Nodes.Add( "Node: " + i.ToString() );
    NewNode.Text = "Node: " + i.ToString();
    
}

HTREEITEM NewNode;
CString strText;
	
for( int i = 0; i < 1000; i++ )
{
	strText.Format( "Node: %d", i );

	NewNode = m_TreeView.InsertItem( strText );

	m_TreeView.SetItemText( NewNode, strText );

	//my function that process pending messages
	ProcessMessages();
}

TreeNode NewNode;
treeView.Scrollable = false;
treeView.BeginUpdate();
 
for( int i = 0; i < 1000; i++ )
{
	NewNode = treeView.Nodes.Add( "Node: " + i.ToString() );    
	NewNode.Text = "Node: " + i.ToString();    
	Application.DoEvents();
}
 
treeView.Scrollable = true;
treeView.EndUpdate();

for(int i = 0; i < _remoteRegKey.GetValue("Foobar").Count; i++)
{
    Console.WriteLine(_remoteRegKey.GetValue("Foobar")[i].ToString());
}

string [] values = (string []) _remoteRegKey.GetValue("Foobar");
 
for(int i = 0; i < values.Length; i++)
{
  Console.WriteLine(values[i]);
}