Hub Client. Registration Exists Async(String) Method
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Asynchronously indicates that the registration already exists.
public System.Threading.Tasks.Task<bool> RegistrationExistsAsync (string registrationId);
member this.RegistrationExistsAsync : string -> System.Threading.Tasks.Task<bool>
Public Function RegistrationExistsAsync (registrationId As String) As Task(Of Boolean)
The registration ID.
The task that completes the asynchronous operation.