Japanese Characters:Is there a way to handle lower case to Upper case conversion


I am trying to convert Japanese Katakana lower case characters to uppercase using the webMethod’s built service pub.string:toUpper by hard coding language=" ja" and country=" JP". But it’s not working. If you have the solution , please reply back to this query.

ァィゥェォャュョッ —lowercase (Input)
アイウエオヤユヨツ—upper case (expected output)

Thanks in advance!