C#- ToLower() is sometimes removing dot from the letter "I"

Question

We have noticed a weird error when calling ToLower() on certain strings.

The input string is:

string s = "DocumentInfo"; string t = s.ToLower(); // sometimes, t == documentinfo // other times, t == documentınfo  (note dot is missing from i - INCORRECT) 

We are passing the string to a web service query downstream, so it is causing problems for us.

My initial guess is that it has something to do with Culture or UICulture, as some of our pages customize these settings per user.

Could this be the issue? Is there are way I can force this to work properly?

UPDATE 2011.07.06

I found that I could duplicate the issue by setting Culture to tr-TR. Not sure if other cultures are impacted.

Answer 1

Try using String.ToLowerInvariant().