This GeoBlazor sample, written in Blazor for .NET developers, demonstrates the WMSLayer (OGC Web Map Service) from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's WMSLayer and WMSSublayer Razor components. The page shows a 3D SceneView centered on Southeast Asia (roughly Bangladesh and Myanmar) viewed from a high altitude with a Web Mercator spatial reference. Instead of an ArcGIS basemap style, the basemap is built from a single WMSLayer pointing at the terrestris OpenStreetMap WMS service with the TOPO-WMS sublayer activated, rendering a topographic OpenStreetMap-derived globe. There are no controls or widgets above the map; the user can pan, zoom, and tilt to explore the globe. The sample is intended to demonstrate using an OGC WMS service as a 3D scene basemap in a Blazor application without writing JavaScript.