InfoPath Dev

using infopath 2007

 i have the following in vb and works fine:

DataSources("external datasource name").CreateNavigator().SelectSingleNode("xpath to field in external datasource", NamespaceManager).SetValue(Application.User.LoginName)

however when putting that in c# we get this error

'Microsoft.Office.InfoPath.XmlFormHostItem.DataSources' is a 'property' but is used like a 'method'

 what should it be in c#?  i can't figure that out and the converter i use says the c# is the same as vb

Thanks

 In C#, indexers are accessed with square brackets, not parentheses:

 DataSources["external datasource name"].CreateNavigator().SelectSingleNode("xpath to field in external datasource", NamespaceManager).SetValue(Application.User.LoginName);

thanks!  i figured it had to be something simple.  i got it to work on another form and i'll pass it to our guy to implement it.