This GeoBlazor sample, written in Blazor for .NET developers, demonstrates loading a KML layer from the ArcGIS Maps SDK for JavaScript via GeoBlazor's KMLLayer Razor component. The page shows a 2D world map rendered with the dark gray basemap style. Above the map is an editable text input pre-filled with a USGS earthquake feed URL (KML data for major earthquakes of magnitude 5.8 or greater over the last 30 days), alongside two buttons: 'Add or Remove KML Layer in code' which imperatively toggles a KMLLayer instance on the MapView via AddLayer/RemoveLayer, and 'Add new KML Layer in Markup' which toggles a declarative KMLLayer element rendered inside the Map markup. When a layer is loaded, earthquake locations are plotted as KML placemarks on top of the basemap. The sample is intended to demonstrate two equivalent ways to consume KML data in a Blazor application without writing JavaScript.