private void populateActivityTree()
{
string errorMsg = String.Empty;
activityTreeView.Nodes.Clear();
DateTime date = DateTime.Now;
DateTime.TryParse(ActivitySearch.Text, out date);
if (date < new DateTime(1900, 1, 1))
{
date = DateTime.Now;
}
List <Activity> acvityList = Controller.GetActivityList(date, out errorMsg);
TreeNode node = new TreeNode();
foreach (Activity act in acvityList)
{
node = new TreeNode();
node.Text = act.ActivityTypeName;
node.Tag = act;
activityTreeView.Nodes.Add(node);
}
}