c# – .NET Framework update to new version – .NET 4 to .NET 4.8 - Faz Business

I have a project running on .NET 4 and it only runs in Visual Studio 2010 web developer express.

I want to upgrade the project to .NET 4.8.

There are the steps I followed:

Open the solution in VS 2022
In properties of class lib and project, I choose .NET 4.8 and save it
I updated the NuGet packages in NuGet package manager for each project in the solution
Update all references of 4.0 to 4.8 in web.config
Set starting project and add reference
Change some code to solve ambiguity error; changing System.Data.EntityState to System.Data.Entity.EntityState like that
Clean and Build
IIS debugger

After all these steps, the project didn’t run.

It is showing an issue in Global.asax file in browser no request is happening just loading and white page

What should to do after this?

Did I do something wrong here? What else do I need to look into?