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C# DataView, DataSet (or other) to do a "group by" filter

trippy1976 asked
Last Modified: 2013-12-17
I am loading a CSV file into DataSet object.  Then putting the data into a DataView so I can easily sort it.  

That's sweet and easy.  But my ultimate goal is to remove any rows where the GUID only occurs in the data set one time.  I tried a filter like this:

sortedData.RowFilter = "COUNT(GUID) > 2 group by GUID";

But of course that does not work.  I think the COUNT thing is okay, but what I want is like on a SQL query for it to group by GUID.  This would naturally remove any records which have a GUID that does not appear more than twice in the data.

Is there a good way to do this?  Or am I going to be forced to loop through the data set after it's sorted, manually deleting the rows I don't want?
// Sort it by GUID then Source
                DataView sortedData = this.csvDATA.Tables[0].DefaultView;
                sortedData.Sort = "GUID,SOURCE ASC";

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