For migrating .NET web or service to Azure App service, follow the guidance from this link - https://learn.microsoft.com/en-us/dotnet/azure/migration/app-service
For migrating .NET application to an Azure VM, see this link - https://learn.microsoft.com/en-us/dotnet/azure/migration/vm
This link - https://learn.microsoft.com/en-us/dotnet/azure/migration/sql provides instructions to migrate a SQL Server Database to Azure
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