# MgGrid — DataSource

> Part of the MgGrid system. See `README.md` for overview and component hierarchy.
> For the underlying `AcSignalRDataSource`: `AyCode.Services.Server/docs/SIGNALR_DATASOURCE/README.md` (in AyCode.Core repo)

## MgGridSignalRDataSource

`GridCustomDataSource` wrapper around `AcSignalRDataSource` for server-side data operations.

- Returns local data instantly for previously-seen filter criteria
- Refreshes from the server in the background
- Handles filter, sort, paging, unique values, and summary calculations locally
- `OnBackgroundRefreshCompleted` event fires when background refresh completes