Sending Document When Click Cancel?

I have a link in aspx page and when i click on it,it shows a popup: open,save,cancel

but when i click cancel on that aspx page no other link works on that page.

code so far:

protected void method1()
{
byte[] byterendered = _Filename.OpenBinary();
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.ContentType = "image/jpeg";
Response.AddHeader("Content-Disposition", "attachment;filename=abc.jpg");
Response.CacheControl = "Public";
Response.BinaryWrite(byterendered);
Response.End();
}

aspx code

<asp:Linkbutton id="link1" runat="server" onClick="method1" Text="LinkA"/>
<asp:Linkbutton id="link2" runat="server" onClick="method2" Text="LinkB" />