I have dtsx file in which having two connection strings.
e.g.
Current connection strings having Development environment entry need to transform for Test,QA and Prod environment using Azure Devops.
I'm used File Transformation but it is not working in Azure DevOps pipeline. Please suggest the solution for SSIS deployment for file transformation.
add those connection strings as project variable in SSIS packages. refer below blog on how to do it. https://learn.microsoft.com/en-us/sql/integration-services/integration-services-ssis-package-and-project-parameters?view=sql-server-ver15
Once you have these project parameters configured you should be able to change those in Azure dev ops build pipeline before deploying to Production, as those project level variables will be available to you in there.