back button bring backs the same message box again

I am working on login page.

In login page i have other links which will lead to someother page.

 But when i enter wrong username/pass i kept  message box to be displayed saying invalid password (after clicking 'OK" in message box)and then when i click on the

other two links in the same login page it brings to new page and when i hit window back button then it bring back the login page with the

message box saying invalid password.

 

How to solve this

 

In general i placed

 protected void Page_PreInit(object sender, EventArgs e)
    {

        Response.AddHeader("Cache-Control", "no-cache");
        Response.AddHeader("Cache-Control", "no-store");
        Response.AddHeader("Expires", " ...