The declaration of your signPathLinkLbl_LinkClicked method should be:
private void signPathLinkLbl_LinkClicked(object sender, LinkClickedEventArgs e) {
}
instead of
private void signPathLinkLbl_LinkClicked(object sender, EventArgs e) {
}
Of course, you have to wire the event of your control to the event handler; in the designer file, there should be a line:
this.signPathLinkLbl.LinkClicked += this.signPathLinkLbl_LinkClicked;