The UICulture property determines the resource files loaded for a page. The Culture property determines how strings such as currency, dates etc are formatted. A culture name For eg: en-US consists of two parts. The first part(en) is the language code and the second part(US) is the country/region code. If you do not specify the country or region code, then you have specified something called a neutral culture.
You can set either the UICulture or Culture properties by using the <%@ Page %> directive or you can set these properties globally in the web configuration file as shown below:
Let's take a simple example where we will format a string to represent Great Britain's currency formatting
Add this to your page directive