Right way to create shared link with password? (C#, .NET, ApiV2)

I'm using following combo: C#, .NET, ApiV2

What's the right way to create shared link with password?

Tried:

Console.WriteLine("----- shareFile function starts -----");
RequestedVisibility visibility = (password == null ? null : new RequestedVisibility().AsPassword);
DateTime date = DateTime.Now.AddDays(7 * dueInWeeks);
var sharedLinkSettings = new SharedLinkSettings(visibility, password, date);
var overAllSettings = new CreateSharedLinkWithSettingsArg(path, sharedLinkSettings);
try
{
  Console.WriteLine("Sharing \"" + path + "\" file starts");
  var shared = await client.Sharing.CreateSharedLinkWithSettingsAsync(overAllSettings);
  Console.WriteLine("----- shareFile function ends -----");
  return shared;
}

But gives error:

Exception thrown: 'Dropbox.Api.ApiException`1' in mscorlib.dll
Exception: Dropbox.Api.ApiException`1[Dropbox.Api.Sharing.CreateSharedLinkWithSettingsError]: settings_error/invalid_settings/...

Not sure about RequestedVisibility thing..

Everything works well without password related parameters.

Quick working example would be very appreciated!

Thanks