C#, gridview

I am new in ASP programming, can anyone let me know what wrong with this code, i can't display the full name and email address.
 protected void lnkUserName_Click(object sender, EventArgs e)
    {

        LinkButton lb = (LinkButton)sender;
        txtUsername2.Text = lb.Text;
        txtPassword2.Text = "********";
        txtConfirmPassword2.Text = "********";
        GridViewRow row = (GridViewRow)lb.NamingContainer;
        Label labelFullName2 = (Label) row.FindControl("labelFullName2");
        Label labelEmailAddress2 = (Label) row.FindControl("labelEmailAddress2");
        txtFullName2 = labelFullName2.Text;
 &nb ...