Write null Datetime field in Access base (mdb)

Question

Good afternoon to all.

Please I need your help.

I am trying to record/update a Datetime-like Birth field, but not always this field will be populated due to business rule sometimes it will be null.

The base used is Access mdb format.

At the moment of recording/updating I’m not getting, see how I’m doing.:

Example:

public DateTime? Nascimento { get; set; }

cmdInsercao.Parameters.AddWithValue("@NASCIMENTO", Cli.Nascimento);

I tried this:

cmdInsercao.Parameters.AddWithValue("@NASCIMENTO", Cli.Nascimento == null ? (object)DBNull.Value : Cli.Nascimento);

and nothing....

DBNull.Value didn’t roll either..

Someone has a solution

Thank you