How would I know whether the link label was clicked at the runtime.

[skor13]

I'm clearly not the only person who doesn't understand what you are trying to say. Perhaps rephrasing?

Public Class Form1
    Dim YourLabelWasClicked As Boolean = False

    Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
        YourLabelWasClicked = True
    End Sub
End Class