I'll have to defer to Henrik, but I think you are correct about it not being able to pull that information for some reason.
I can pull back the 'Name' property for anything I choose, but LastLogonDate is not available when selecting a User Object (My ID specifically).
I know I can get this via PowerShell but I guess I'm curious why specific properties are not available.
Henrik, I know the code being used is .NET which i'm not extremely familiar with, but is there an option like in PowerShell to return 'more' properties than a standard 'Get-ADuser' returns?
In Powershell, I'd type the following and LastLogonDate would not be returned:
get-aduser USERNAME
However, if I type this, I get a TON more data back which does include the LastLogonDate
get-aduser USERNAME -Properties *
Or I could specifically request one additonal property:
get-aduser USERNAME -Properties LastLogonDate