in logout functionality

   (problem with the logout and the browser back button) 

 

dear all;

        i have set logout linkbutton in mu application when the user logs out his session become null and he is taken to to the login page ....but the thing is if  the back button of the browser gets clicked  it goes the previous page .

knowing that i have written the following code in each page_load for each page in the application ..... is it right????????????

 
protected void Page_Load(object sender, EventArgs e) ...