Implement exponential backoff when using ADO.NET

Retry a failed connection by using exponential backoff when connecting to Cloud SQL for PostgreSQL by using ADO.NET with the Polly .NET library.

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Code sample

C#

Policy
    .Handle<NpgsqlException>()
    .WaitAndRetry(new[]
    {
        TimeSpan.FromSeconds(1),
        TimeSpan.FromSeconds(2),
        TimeSpan.FromSeconds(5)
    })
    .Execute(() => connection.Open());

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