You could look at this simple ASP.NET app that uses the DotSpatial.WebControls assembly for the map UI:
https://macpgmr.github.io/MacXPlatform/PascalDynLibs_3.html#DotSpatial
https://macpgmr.github.io/MacXPlatform/PascalDynLibs_3.html#DotSpatial