C# - If datetime return null show 'Unknown' message.

Question

Hello everyone,

 

I have datatable that contain data like this

 

public Nullable<DateTime> LogInTime { get; set; }
      public Nullable<DateTime> LogOutTime { get; set; }

LogInTime = m.Field<DateTime?>("LogInTime"),
                  LogOutTime = m.Field<DateTime?>("LogOutTime")

 

And here I have a Linq query for, if LogOutTime is existing null return 'Unknown' message.

 

var logOutDate = (from A in logList select (A.LogOutTime.ToString() ?? "Unknown").ToString().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)).Distinct();

 but getting empty string array in 'logOutDate' object.

 

How can I get Unknown messege if LogOutTime existing null value?