If you have an Asp.Net web application, you can also set it in the web.config
so that it is the same throughout the whole web application
<system.web>
...
<globalization
requestEncoding="utf-8"
responseEncoding="utf-8"
culture="en-GB"
uiCulture="en-GB"
enableClientBasedCulture="false"/>
...
</system.web>