https://docs.oracle.com/en/database/oracle/oracle-database/26/odpnt/DataReaderIsDBNullAsyncOverloads.html
IsDBNullAsync
https://learn.microsoft.com/es-es/dotnet/api/system.data.common.dbdatareader.isdbnullasync?view=netframework-4.8.1&viewFallbackFrom=net-9.0
DbDataReader.IsDBNullAsync Method (System.Data.Common) | Microsoft Learn
Asynchronously gets a value that indicates whether the column contains non-existent or missing values.
system datamethodcommonmicrosoftlearn