Getting Out Of Form

I am trying to add records to SQL database, thru <form> </form> on click of button, The system is working fine, Databse table is getting updated correctly.

But screen displays the same form again while i want it to open another asp.net page i.e. buy.aspx and also generate an e-mail automatically.

I m stuck. Please help.

 pcg

 

Relevent code of mine is as below.

<script runat="server">

    void addtosalelist(Object sender, EventArgs e)
    {
 ....
 ....
 dbConnection.Open();
 ....
 ....
        dbConnection.Close();
     }

 

<form action="buy.aspx" method="post" runat="server">
...
...
...
<asp:Button id="button1" onclick="addtosalelist" runat="server" Text="Submit"></asp:Button>
                                   
</form>