Hi

All the data in the grid had loaded and was displayed long before I clicked any of the Paging buttons.

The error is because I am setting the Datagrid data programatically as part of the Page_Load event.

Everywhere else on the site I bind the Datagrid to a DataSourceControl then trap the Selecting event of the DataSource and set the e.result property to the data returned.

I changed this page to do the same and now it is working fine.  I guess it doesn't like you setting the DataGrid in the Page_Load event.

Thanks

Steve