c# - Reportviewer - Make consecutive repeating rows become one -

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Will I know how to do with the details below?

Say I have a dataset of 4 columns, and I have a consistent repeat of date , name and id There are criteria, but there is no quantity. How can I make a row that tells all 3 rows before? How can I do this in the report viewer? 

  Date Name ID Quantity____________________________________________ 21/3 John 001 10 John 001 20 John 001 10 And I want to make it:  
  Date Name ID Quote____________________________________________ 21/3 John 001 40   
 Thanks in advance.   
 
 
 I solved it using a group by query, for example:  < / Pre> 
  The date, name, id date, name, id, amount (quantity) as quantity from the order by Epibable Group, although simple, I thought the report viewer could do this. Thanks

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