This GeoBlazor sample, written in Blazor for .NET developers, demonstrates the WCSLayer (OGC Web Coverage Service) and RasterStretchRenderer from the ArcGIS Maps SDK for JavaScript exposed through GeoBlazor's WCSLayer, RasterStretchRenderer, MultipartColorRamp, AlgorithmicColorRamp, and DimensionalDefinition Razor components. The page shows a 2D light-gray basemap of the world. Above the map two buttons sit side by side and remain disabled until the map finishes rendering: the first toggles a colorized sea-temperature WCSLayer that is styled with a three-stop blue to cyan to yellow to red HSV color ramp using a standard-deviation stretch, and the second toggles a black-and-white version of the same layer. Both layers point at the NOAA sample ImageServer's WCS endpoint and are restricted to sea level (StdZ=0) at a fixed timestamp. While either layer is being added or removed the map cursor is set to wait. The sample is intended to demonstrate consuming an OGC WCS coverage and applying a custom raster color ramp in a Blazor application without writing JavaScript.