Public Function BeginGetEntityTypes( _
   ByVal dataSourceName As String, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

Dim instance As CommonService
Dim dataSourceName As String
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginGetEntityTypes(dataSourceName, callback, asyncState)

public IAsyncResult BeginGetEntityTypes( 
   string dataSourceName,
   AsyncCallback callback,
   object asyncState
)