On this page, a commenter writes:
Do NOT ever use .ToUpper
to insure comparing strings is case-insensitive.
Instead of this:
type.Name.ToUpper() == (controllerName.ToUpper() + "Controller".ToUpper()))
Do this:
type.Name.Equals(controllerName + "Controller",
StringComparison.InvariantCultureIgnoreCase)
Why is this way preferred?
Here is the answer in details .. The Turkey Test (read section 3)
As discussed by lots and lots of people, the "I" in Turkish behaves differently than in most languages. Per the Unicode standard, our lowercase "i" becomes "İ" (U+0130 "Latin Capital Letter I With Dot Above") when it moves to uppercase. Similarly, our uppercase "I" becomes "ı" (U+0131 "Latin Small Letter Dotless I") when it moves to lowercase.
Fix: Again, use an ordinal (raw byte) comparer, or invariant culture for comparisons unless you absolutely need culturally based linguistic comparisons (which give you uppercase I's with dots in Turkey)
And according to Microsoft you should not even be using the Invariant... but the Ordinal... (New Recommendations for Using Strings in Microsoft .NET 2.0)