webservice returning a string

dear team

     i am new to Mobile application. kindly help to resolve the following question

i have a webservice which will return a single value.

the format is

<?html version="1.0" encoding="utf-8" ?>

<stirng xmlns="http://tempuri.org/">HELLO WORLD</string>

this code is .net 2005 sample webservice return value.

i want to assing this value to a text box.

kindly help.