ASP.NET Core configuration providers read configuration data from common sources such as JSON files and databases. But you can use other sources by creating custom configuration providers.

Google is your friend. There are a ton of third party libs that will load an excel file into an ado.net dataset. From there you can use the select method to do your search.

Q&A What's Next for ASP.NET Core and Blazor By David Ramel 06/18/2024 Since its inception as an intriguing experiment in leveraging WebAssembly to enable dynamic web development with C#, Blazor has ...