How to get the Row Number per Distinct Records?

Row Number	Name	Phone Number
1	John Doe	(555) 123-1221
1	John Doe	(555) 144-9989
2	Smith	(666) 191-1201
3	Jane Doe	(555) 188-0191
3	Jane Doe	(555) 189-0192
3	Jane Doe	(555) 190-0193

Here are the records I get back using a Grouping on "Name". I would like to assign a Row Number for each "Distinct" row. I've tried all the possible aggregate functions with no luck! Can anybody help me with this? Thanks.

Please try something like this:

=RunningValue(Fields!Name.Value & Fields!PhoneNumber.Value ,CountDistinct, Nothing)

|||Thanks. I didn't know that Expression can take multiple values!!! Now I know!