What is the fastest (built-in) comparison for string-types in C#

Question

What is the fastest built-in comparison-method for string-types in C#? I don\'t mind about the typographical/semantical meaning: the aim is to use the comparator in sorted lists

Answer 1

This might be useful to someone, but changing one line of my code brought the unit testing of my method down from 140ms to 1ms!

Original

Unit test: 140ms

public bool StringsMatch(string string1, string string2)
{
    if (string1 == null && string2 == null) return true;
    return string1.Equals(string2, StringComparison.Ordinal);
}

New

Unit test: 1ms

public bool StringsMatch(string string1, string string2)
{
    if (string1 == null && string2 == null) return true;
    return string.CompareOrdinal(string1, string2) == 0 ? true : false;
}

Unit Test (NUnit)

[Test]
public void StringsMatch_OnlyString1NullOrEmpty_ReturnFalse()
{
    Authentication auth = new Authentication();
    Assert.IsFalse(auth.StringsMatch(null, "foo"));
    Assert.IsFalse(auth.StringsMatch("", "foo"));
}

Interestingly StringsMatch_OnlyString1NullOrEmpty_ReturnFalse() was the only unit test that took 140ms for the StringsMatch method. StringsMatch_AllParamsNullOrEmpty_ReturnTrue() was always 1ms and StringsMatch_OnlyString2NullOrEmpty_ReturnFalse() always <1ms.