<PackageReference Include="System.Data.SqlClient" Version="4.8.0" />

System.Data.SqlClient.PoolBlockingPeriod

public enum PoolBlockingPeriod
Specifies a value for the PoolBlockingPeriod property.
AlwaysBlock = 1

Blocking period ON for all SQL servers including Azure SQL servers.

Auto = 0

Blocking period OFF for Azure SQL servers, but ON for all other SQL servers.

NeverBlock = 2

Blocking period OFF for all SQL servers including Azure SQL servers.