Dropdown Section Property of Custom Activity. in workflow

I refer this solution but where that code enter I done know,
Can you please elaborate,
I used library workflow, As bellow, but it’s not working
NewActivity - Copy.xaml (16.8 KB)

@suraj23 Can you tell us what do you want to do? :sweat_smile: What is the Process you want to Create?

@supermanPunch I am trying to create Library for SMTP mail activity and I want in_LogonMail argument as Drop-down same (OpenBrowser activity- BrowserType)
Use case as bellow,
NewActivity - Copy.xaml (16.8 KB)

@suraj23 Is it a Library that can be used to Send Mail to more than 1 Recipients?

Yes,
Because I don’t want to show Host Port, Server, Logon Email, Password to others
Just call Library and pass input parameter,

@suraj23 instead of IEnumerable, You can make it as Array of String

Thanks @supermanPunch, but it’s not working

@suraj23 What’s Not Working?

instead of IEnumerable, You can make it as Array of String
This solution is not working, If Possible can you send .xaml file

Did you get a solution for this?