private void DeleteActivityButton_Click(object sender, EventArgs e)
{
if (activityDataSource.DataSource != null)
{
string errorMessage = String.Empty;
Activity activity = (Activity)activityDataSource.DataSource;
Controller.DeleteActivity(activity, out errorMessage);
if (!String.IsNullOrEmpty(errorMessage))
{
MessageBox.Show(errorMessage);
}
else
{
populateActivityTree();
}
}
else
{
MessageBox.Show("Please first select an activity to delete.");
}
}