Incrementing Datagrid Value -- Simple Question

[Ron]

I have a Datagrid that is bound to a datasource. In the table, I have a
"Next" and a "Previous" button. When the user clicks either button, I want
to display the next or previous items. My question is this: How can I
increment/decrement the value that is being bound to the datagrid?

<a href='<%# DataBinder.Eval (Container.Data Item, "officeID",
"LeaseDetails.a spx?officeID={0 }") %>

How can I increment the value for "officeID"?


Thanks,

Ron