Queries in RTC

Hello All,

I am trying to write a query which fetches work items from a project area based on the filtering of Summary filed.

For E.g. say I enter the value in a text field as "hello" then all the work items in a particular project area whose summary contains "hello" should be fetched.

I am a little new to this. I tried few things.
How do I create a proper expression for that ?

Expression newExpr = new VariableAttributeExpression(attribute, AttributeOperation.CONTAINS,
                    What to pass here);

For the above expression how do I pass my Summary String ?


Thanks for any help :)


Regards,
Arshad