How To Break Recursive function in asp.net

public void load_tree()
{
   DataSet PrSet = PDataset("Select * from categories where idparentcategory =1");
   TreeView1.Nodes.Clear();
   foreach (DataRow dr in PrSet .Tables [0].Rows)
   {
      if ((int)dr["idparentcategory"] == 1)
      {
         TreeNode tnParent = new TreeNode();
         tnParent.Text = dr["categoryDesc"].ToString().Trim();
         tnParent.Value = dr["idCategory"].ToString().Trim();
         tnParent.Expand();
         TreeView1.Nodes.Add(tnParent);
         FillChild(tnParent, tnParent.Value);
       }
    }
}

public int FillChild(TreeNode parent, string idCategory)
{
   DataSet ds = PDataset("Select * from categories where idparentcategory =" + idCategory);
   if (ds.Tables[0].Rows.Count > 0)
   {
      foreach (DataRow dr in ds.Tables[0].Rows)
      {
         TreeNode child = new TreeNode();
         child.Text = dr["categoryDesc"].ToString().Trim();
         string temp = dr["idCategory"].ToString();
         child.Collapse();
         //parent.ChildNodes.Add(child);
         //TreeView1.Nodes.Add(child);
         parent.ChildNodes.Add(child);
         FillChild(child, temp);
      }
      return 0;
    }
    else
    {
       return 0;
    }
}