Not a kata issue then.

Can you say which languages use state and have this keyword?

Rename some parameters:

• string[] name to names ie plural, more than one
• string state to something less ambiguous, state is a reserved keyword in some languages

Your code won't work, have you seen the initial code?

public static class StringExtensions
{
  public static bool IsUpperCase(this string text)
  {
    // your code here
  }
}

In the tests, your code is used like this: "some string".IsUpperCase(), not like this: IsUpperCase("some string")

This will invalidate all solutions as kata description is shared among languages