When it comes to using object-oriented programming languages for development & testing, C# is still considered a good choice by the developer community. MSTest/Visual Studio, xUnit.net, and NUnit are some of the top-most frameworks that can be used for automated browser testing. While using NUnit, you can further leverage the capabilities of NUnit Annotations to build a more robust framework.
Any discussion about testing is incomplete without the mention of the Selenium framework. Selenium is a powerful test framework that can be used for automated browser testing as it is compatible with popular programming languages like C#, Python, etc.