This quick start shows you two ways of connecting to Azure Service Bus: passwordless and connection string. The first option shows you how to use your security principal in Azure Active Directory and role-based access control (RBAC) to connect to a Service Bus namespace. You don't need to worry about having hard-coded connection string in your code or in a configuration file or in a secure storage like Azure Key Vault. The second option shows you how to use a connection string to connect to a Service Bus namespace. If you are new to Azure, you may find the connection string option easier to follow. We recommend using the passwordless option in real-world applications and production environments. For more information, see [Authentication and authorization](../../../articles/service-bus-messaging/service-bus-authentication-and-authorization.md). You can also read more about passwordless authentication on the [overview page](/dotnet/azure/sdk/authentication?tabs=command-line).
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