VS 2015 keeps crashing when attempting to build?

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C#

I have an application connected to SQL Server. Whenever I try to run it, I never get past "Build Started" and then a popup tells me that there are build errors and asks me if I want to see them, but before I can even click on 'Yes', VS freezes and crashes.

I tried to run another project to see if the problem was isolated to the first project or not. When I ran the second project, it also initially crashed, but after VS restarted automatically, it ran just fine.

I tried to run the first project again, but VS 2015 just keeps crashing (even after restarting several times). When building, it says there are no errors, but when I look at the error list prior to that, there are none.

What I have tried:

1. I tried restarting VS 2015, did not work.
2. I also changed the viewing filter in the Error List from "Build + IntelliSense" to "Build Only", but the Error List stays empty.
3. I tried Clean Solution. VS crashed, then restarted.
4. I tried Rebuild. VS crashed, then restarted.