Cascading Dropdown List from Single SQL Table

I need to populate a series of cascading dropdown boxes from SQL. When the user selects an entry in the first dropdown box I need to run a SQL query based on the selected item to populate the input for the second dropdown.

I’ve done this years ago with asp web forms however for this project I’m using dot net Core v2 with Razor pages. What do you think is the best way to accomplish this?

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