Arc/Info ASCII Grid is one of many supported raster formats in Map Suite. In addition to displaying ESRI grid files you can also query and edit the data in Map Suite. Here is the latest sample demonstrating the ability for the user to select an area of the grid (raster layer) by using a spatial query, and then updating the underlying cell values with a user specific value.
This has been integrated as a core feature in Map Suite therefore it can be used in the web or desktop products. Download the sample directly from GitHub to start your free evaluation and take advantage of this new feature.