Reload user control?

Hi,
I'm working on a webproject where I have several different user controls loaded on a WebForm.
A problem arises when I in one webcontrol makes a change that should be picked up by another user control.
For example a webshop. I have a datagrid of products in the shopping cart in one user control. In another I have an overview of the shopping cart (lists the products and a shows an order total).
When I remove a product from my datagrid I want the overview to reflect the changes. The only solution I could think of was to do a Server.Transfer() in the postback to "reload" the page, but it sounds to me like a complete waste of resources to load the page twice for a single postback.

Does anyone have any tips on how I could do it differently?

My shopping cart overview does not have an if(!IsPostBack) clause.

Thanks in advance
/Mats
.

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