public static void DisableLinkButton(LinkButton linkButton)
{
    linkButton.Attributes.Remove("href");
    linkButton.Attributes.CssStyle[HtmlTextWriterStyle.Color] = "gray";
    linkButton.Attributes.CssStyle[HtmlTextWriterStyle.Cursor] = "default";
    if (linkButton.Enabled != false)
    {
       linkButton.Enabled = false;
    }

    if (linkButton.OnClientClick != null)
    {
        linkButton.OnClientClick = null;
    }
}