Ref a dataset inside a procedure in C#

Hi,

Page_Load: All this does is to collect a dataset named folders. And call a
procedure called DisplayFolder and takes the roottreenode as an in
parameter.

private void Page_Load(object sender, System.EventArgs e)
		{
			Microsoft.Web.UI.WebControls.TreeNode treenode1 = new TreeNode();
			treenode1= oTree.GetNodeFromIndex("0");


			//Henter ut data fra document klassen
Business.Document objDocument = new Business.Document(GetConnStr());
DataSet Folders = objDocument.GetAllFolder();

DisplayFolder(treenode1);
		}

//Recursive call of the procedure

In the Display folder function I want to traverse the dataset and do some
logic, when I find a treenode I  want a recursive call to the procedure with
the current treenode as a the paramer.

But how can I access the dataset inside this procedure?
I cant pass the data set as an in parameter I guess? The I guess a new
dataset will be build each time?

if a make the procedure as this:
void DisplayFolder(TreeNode treenode1,DataSet Folders)
		{
}

I would have to pass the dataset for each time the procedure shoul call it
self.


Cheers,
jana