What Reference Should I add for TextInfo and Cultureinfo?

[zenfreak]

When trying to use :

TextInfo textInfo = new CultureInfo("en-US", false).TextInfo;
title = textInfo.ToTitleCase(title);

I'm getting this errors:

Compile code of  Error in action "CS0246" "The type or namespace name 'TextInfo' could not be found (are you missing a using directive or an assembly reference?)". [Row: 2; Column: 1]

and

Compile code of  Error in action "CS0246" "The type or namespace name 'CultureInfo' could not be found (are you missing a using directive or an assembly reference?)". [Row: 2; Column: 25]

So What Reference Should I add for TextInfo and Cultureinfo?

 

[VladZen]

You should enable System.Globalization - https://msdn.microsoft.com/ru-ru/library/system.globalization.cultureinfo(v=vs.110).aspx

 

[zenfreak]

I see now I should have seen this myself.

Thank you for your time!