How to check if string value exists in a list using C#

In this post, I will explain with an example, how to check string value exist in a list using C# and it will be quicker than LINQ.

here, string comparison specifies the culture, case and sort rules to be used by string methods.

If you have any questions, post here. Also, provide your valuable suggestions and thoughts in form of comments in the section below.

Thank you !!!