Adding an existing starter project to visual studio 2022 error - c#

I get this error when trying to add an existing project to my solution file, I'm getting into C# and its the only issue stopping me from being able to run my CSharp code, I'm using tutorials so I don't have much knowledge about VS yet.

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CSS/JS errors clogging Visual Studio 2015 Error List in C# MVC Project

I have started using ASP.NET Core with Visual Studio 2015, and have been getting frustrated with the error list.
With visual studio 2013 only C# errors would show, but visual studio 2015 errors from js and css (which often come from minified libraries and packages i have imported) are clogging the area.
It wont stop the build, but it is annoying having to sift through them to find the CS errors.
I have looked up on google and here to find the answer, but am unable to find a solution.
I found the answer 5 minutes after posting bounty.
In the error list next to filters I had Build + intellisense on, once I changed that to only "BUILD" it gave the desired result

Old Visual Studio project with ambiguous reference errors

A client has given me an old (approx. 2010) .sln project for visual studio that they would like to have modified. The problem is that it is large and it now has a lot of errors in it from ambiguous references. The time it would take me to fix all the references is not worth the small change the client wants to make to the project. Is there a way of reverting this project so that I can open it without the errors? I have tried opening it in VS 2010 and VS 2013 but the errors are still there.
Any help would be greatly appreciated.

Visual Studio 2015 crashes when i open a C# file

I just installed VS2015 Professional with Update 2 and created a new MVC4 web application. I created a view - no problem, created a new script - no problem. But when i open any C# file, even a new one that i create, my VS has stopped working followed by visual studio is restarting.. I can even run the project no problem, it seems that only opening C# files causes the project to bug. has anyone else had this problem or know how to fix this?

Visual Studio 2013 Ultimate "Error Writing the Project File" C#

I'm trying to make a C# Windows Forms Application, but whenever I try, I get this error:
"Error writing the project file."
I also get this error when I try making a Basic application or any other C# application. I tried searching the internet for a solution, but nothing worked. I tried reinstalling NuGet and MSXML6. Neither worked.
Edit
I am able to make c++ projects, just not C# and Basic

How to tell if a C# project can only be opened in VS 2013?

I have a massive* C# solution recently handed to me that I am trying to straighten out and get to correctly work. The vast majority of it was developed in Visual Studio 2012 and open with it just fine. But I am unable to open a few projects, and Visual Studio isn't able to tell me why. So I'm wondering if there is some simple way to check if these projects that weren't able to be opened were developed in VS 2013.
*massive based on projects I've worked on; YMMV.

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