Adding foreign language to an asp.net website

I'm using a web API in my asp.net project and get an username from that API which can be in different language. But when i add that username in aspx page, it shows some symbols. how can i fix it? How can i use various language in my asp.net web pages?
like : i get this username [ ???? ] from API, and i want to add this in my page
 
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