How to converty UTF8 to ASCII

Question

Hello,
I am working on pocket PC, when i am communicating to the server (written in java) it send response through stream.writeUTF() and when i read its response at client (written in C# hence cant do readUTF() ) i get unicode character.( I read the response through response.readline()) .

How can i convert this UTF to ASCII?

I have tried many way like encoding.convert(---) etc but non is working.
Please help.