C# - Add Multiple Controls To Panel In Webforms?

I would like to be able to add multiple label controls to a panel and display them on an onlick event. The code I have does what I want it to the first time, then the label is simple replaced with a new label on the second onlick event and so on.

Here is what I have so far:

private void createTaskLabel(Guid GoalID, string Goal)
{
Label taskLabel = new Label();
taskLabel.ID = GoalID.ToString();
taskLabel.Text = Goal.ToString();
TaskPanel.Controls.Add(taskLabel);
}

So, for instance, this creates a new label with a uniqueID (handled elsewhere) and places it within the panel and displays it. When the onlick fires again, the same label is simply replaced instead of a new one appearing below it.