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c# - check if char isletter

i want to check if a string only contains correct letters. I used Char.IsLetter for this. My problem is, when there are chars like é or á they are also said to be correct letters, which shouldn't be.

is there a possibility to check a char as a correct letter A-Z or a-z without special-letters like á?

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bool IsEnglishLetter(char c)
{
    return (c>='A' && c<='Z') || (c>='a' && c<='z');
}

You can make this an extension method:

static bool IsEnglishLetter(this char c) ...

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