Web Services Developer's Guide → Tips for Writing Applications → Supported Character Encoding
The SBM Web services use UTF-8 encoding. Single-byte characters are automatically supported with UTF-8. To enable support for multi-byte characters, you must set the expected encoding to UTF-8 on the client side. In Visual Studio 2005 C#, you can do this by overriding the GetReaderFromMessage method and setting the reader's encoding to UTF-8.
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