Migrating project from .Net framwork 4.8 to .Net8 Issues

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I am working on the migrating my ASP/net project from .Net framework 4.8 to .Net8 . After migration, it giving me lot of error. almost 9k and mostly related to system.web and ajaxcontroltoolkit and gridview. So My question is what should be alternate of these libraries (system.web and ajaxcontroltoolkit and gridview), references. Should i transform into React or UI library like bootstrap or material?

Your help will be highly appreciable.

I am doing through microsoft update assistant. I did copied all remaining files that are not migrated through update assistant. I search alot to find alternative but no luck

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