Do I have to add "<%@ Register assembly=" to every page?

I upgraded DevExpress components but in my application I have to change every <%@ Register assembly="Dev....... version=.... line in every page.

Is there any way to do this without putting same lines to every page? Can't I do this in web.config page?

 <%@ Register Assembly="DevExpress.Web.ASPxGridView.v10.1, Version=10.1.6.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" 
Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>