关于TREEVIEW的结点判断?
foreach(DataRowView drv in dv)
{
tmpNd=new TreeNode();
tmpNd.ID=drv["NodeId"].ToString();
tmpNd.Text=drv["NodeName"].ToString();
tmpNd.ImageUrl="images/"+drv["Icon"].ToString();
if (为末结点)
tmpNd.NavigateUrl=drv["Address"].ToString();
else
tmpNd.NavigateUrl=drv["Address"].ToString()+"?id="+drv["NodeId"].ToString();
这个代码里的为末结点的条件该怎么写?