How to get appSettings value in web.config on framework net core 8

Dear All

How to get value from appSetings (“program.servername”) in web.config using net core 8.

<configuration>
<appSettings>
<add key=”Wisej.LicenseKey” value=””/>
<add key=”Wisej.DefaultTheme” value=”Bootstrap-4″/>
<add key=”program.servername” value=”localhost”/>
</appSettings>
</configuration>

in Framework 4.x,its return value=”localhost” using code

string value = System.Configuration.ConfigurationManager.AppSettings[“program.servername”];

but if using net core 8, return value=”null” using the same code. (program didn’t find the configuration key, i had try to copy file web.config to folder \bin\Debug\net8.0, the result is same).

Thanks