Many Event Hub operations take place within the scope of a specific partition. Because partitions are owned by the Event Hub, their names are assigned at the time of creation : azure-sdk-for-net/README.md at main · Azure/azure-sdk-for-net · GitHub
var connectionString = "<< CONNECTION STRING FOR THE EVENT HUBS NAMESPACE >>";
var eventHubName = "<< NAME OF THE EVENT HUB >>";
await using (var producer = new EventHubProducerClient(connectionString, eventHubName))
{
string[] partitionIds = await producer.GetPartitionIdsAsync();
}