I am trying to do efficient paging with a gridview without using a datasource control. By efficient, I mean I only retrieve the records that I intend to show.
I am trying to use the PagerTemplate to build my pager functionality.
In short, the problem is that if I bind only the records that I intend to show on the current page, the gridview doesn't render its pager template, so I don't get the paging controls.
It's almost as if I MUST bind more records than I intend to show on a given page, which is not something I want to do.
Best Answer
You need to create a custom gridview control that inherits from GridView. Without the DataSourceControl, the gridview does not have knowledge of the total number of records that could potentially be bound to the control. If you bind 10 out of 100 records and you set the PageSize property to 10, the gridview only knows that there are 10 records which will be less than or equal to the PageSize and the pager control will not display. In order for your gridview to show the pager, it has to know the total number of records that could potentially be retrieved. By inheriting the gridview and overriding the InitializePager method, we can intercept the pagedDataSource and modify the AllowCustomPaging and VirtualCount methods.
This is the one I created
Then when you are binding the data: