try
{
DateTime dt = DateTime.Parse("2016-06-06 00:00:00");
if (DateTime.Now > dt)
{
//throw new Exception(dt2.ToString());
Response.Redirect("Login.aspx");
return; 
}
}
catch (Exception ex)
{
//ClientScript.RegisterStartupScript(ClientScript.GetType(), "", ""); 
Response.Redirect("Login.aspx");
return;
}