This GeoBlazor sample, written in Blazor for .NET developers, demonstrates the CSVLayer from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's CSVLayer Razor component. The page shows a 2D world map drawn with a Stereographic projection basemap loaded from an ArcGIS Online portal item. On top of the basemap a CSV feed of NOAA hurricane track points is rendered through a UniqueValueRenderer keyed on the Category field, with each storm category (1 through 5) drawn as a distinct PictureMarkerSymbol firefly icon. Each point exposes a PopupTemplate showing the storm name, ISO time, pressure, and wind speed. Above the map is a labeled text input plus an Add new CSV Layer! button that, once the view is rendered, constructs an additional CSVLayer from any URL the user enters and adds it to the map at runtime. An ExpandWidget in the upper-left corner houses a LegendWidget that documents the hurricane category symbols. The sample is intended to demonstrate declarative and dynamic CSV data sources in a Blazor application without writing JavaScript.