How to fix strange conversion from String.ToUpper() in C#

I'm trying to show something like "contáctenos" in uppercase, but when I use the string.toUpper() method I have the strange result "CONTáCTENOS" instead of "CONTÁCTENOS".

The page "culture" is set correctly to "es-ES" and the "uiculture" too. How can I obtain the correct开发者_如何学Go result if it's possible, without using regex or replace.

Thanks in advance...

use:

.ToUpper(new CultureInfo("es-ES", false));

reference: http://msdn.microsoft.com/en-us/library/24kc78ka.aspx

The string.ToUpper() function uses CultureInfo.CurrentCulture, not the page's specific culture or the CurrentUICulture. You can pass the page's CultureInfo into the ToUpper function and this should properly transform your string.