anyone explain this linkbutton code working step by step

Question

protected void LinkButton1_Click(object sender, EventArgs e)

{

var lb = (LinkButton)sender;

var row = (GridViewRow)lb.NamingContainer;

if(row!=null)

{

var lblid = row.FindControl("lblid") as Label;

int nid = Convert.ToInt32(lblid.Text);

Response.Redirect("Register.aspx?id=" +nid);

}

}