C# - Remove rows with the same column value from a DataTable

Question

I have a DataTable which looks like this:

 ID   Name    DateBirth
.......................
 1     aa      1.1.11
 2     bb      2.3.11
 2     cc          


        

Answer 1

1. Get a record count for each ID

var rowsToDelete = 
    (from row in dataTable.AsEnumerable()
    group row by row.ID into g
    where g.Count() > 1

2. Determine which record to keep (don't know your criteria; I will just sort by DoB then Name and keep first record) and select the rest

select g.OrderBy( dr => dr.Field( "DateBirth" ) ).ThenBy( dr => dr.Field( "Name" ) ).Skip(1))

3. Flatten

.SelectMany( g => g );

4. Delete rows

rowsToDelete.ForEach( dr => dr.Delete() );

5. Accept changes

dataTable.AcceptChanges();