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Clustering and custom applications

So lets say we have a clustered environment setup. We have a cluster SQL Server (I don’t know exactly how its done but lets just say its been done for the sake of argument). Now if a website or application is trying to access that database for read/write (say an ASP.NET app or a C# Winforms app) and during that time SQL goes down – it takes a couple of minutes for the clustering failover to take affect to switch to another node. What happens during this time?