private void Power_OnClick(object sender, EventArgs e)
{
ConfigHelper.CurrentUserId = Guid.Empty;
Log4net.LogInfo(Log4net.LogAction.Logout, this.ToString());
// set the IsLoggedOn to false will redirect to Logon Page.
this.Context.Session.IsLoggedOn = false;
VWGContext.Current.HttpContext.Session.Abandon();
VWGContext.Current.Transfer(new Public.Logon());
}