CS Version: http://code.msdn.microsoft.com/CSSharePointRefreshParentPa-f9a2ba04
VB Version: http://code.msdn.microsoft.com/VBSharePointRefreshParentPa-53a089e7
The code sample shows how to close the SharePoint modal dialog and refresh the parent page using Server side API. The solution is to write JS directly to the http Response object that will close the dialog. In order to refresh the parent page when the dialog is closed, you can pass the DialogResult enum value to SP.UI.ModalDialog.RefreshPage as parameter. The enum value is returned by dialogReturnValueCallback function.
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