How can i determine a hexadecimal range

Hi guys
I have an application that converts a text(in any language) into it's Unicode.
This application is supposed to work in any regional/foreign language. My question is, how i know which language the char point character belongs to?  I'm aware that there are hexadecimal ranges for each language/script.
In C# is there a way to check for the presence of a char point in a hex range?