public async Task CloseConnectionAsync(string connectionId, string reason, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(connectionId))
{
throw new ArgumentException(NullOrEmptyStringErrorMessage, nameof(connectionId));
}
var api = await _restApiProvider.GetCloseConnectionEndpointAsync(_appName, _hubName, connectionId, reason);
await _restClient.SendAsync(api, HttpMethod.Delete, _productInfo, handleExpectedResponseAsync : null, cancellationToken : cancellationToken);
}
