Check out example codes for "static class can have non static member in c#". It will help you in understanding the concepts better.

Code Example 1

In general, static means “associated with the class, not an instance”.
// Search c# static review for more detail

Code Example 2

Static class can't contain non-static members because by definition it can't be instantiated so there's no possibility to use these members. However, static members in non-static class can be used without having class instance - a bit different scenario,

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