Display row count of dataset after grouping in report header?

My dataset has 500 rows, but if I group that data by field DeptId, there are only 20 rows.
I used something like the following, but it tells me that I can't use RowNumber in the page header:
=RowNumber(Fields!DeptId.Value, "DataSetTeachers")
I also tried something like CountRows("DataSetTeachers"), but that give me the total rows, which isn't what I want.
Thanks.

Hi,
You can use CountDistinct function. This is the expression that I used in the page header:
="Number of rows: " & Countdistinct(Fields!Date.Value,"DataSet1")
See the result:
Hope it helps.
Tracy Cai
TechNet Community Support

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Hello, I need a report that will display the name of the SOURCES, and compare the number of sources received TODAY and YESTERDAY
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Hi ,
Thanks for the reply , that is successful at getting past the issue of having 100% as the result in every row which would happen if we used a measure built in the Business Model and Mapping layer.
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Please remember to mark the replies as answers if they help you and unmark them if they provide no help.

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http://apex.oracle.com/pls/otn/f?p=31517:7
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
http://www.amazon.de/Oracle-APEX-XE-Praxis/dp/3826655494
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Display row count of dataset after grouping in report header?

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