What is the best way to remove duplicates from a datatable?

Question

I have checked the whole site and googled on the net but was unable to find a simple solution to this problem.

I have a datatable which has about 20 columns and 10K

Answer 1

I think this must be the best way to remove duplicates from Datatable by using Linq and moreLinq Code:

Linq

RemoveDuplicatesRecords(yourDataTable);


private DataTable RemoveDuplicatesRecords(DataTable dt)
{
    var UniqueRows = dt.AsEnumerable().Distinct(DataRowComparer.Default);
    DataTable dt2 = UniqueRows.CopyToDataTable();
    return dt2;
}

Blog Article : Remove Duplicate rows records from DataTable Asp.net c#

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MoreLinq

// Distinctby  column name ID 
var valueDistinctByIdColumn = yourTable.AsEnumerable().DistinctBy(row => new { Id = row["Id"] });
DataTable dtDistinctByIdColumn = valueDistinctByIdColumn.CopyToDataTable();

Note: moreLinq need to add library.

In morelinq you can use function called DistinctBy in which you can specify the property on which you want to find Distinct objects.

Blog article : Using moreLinq DistinctBy method to remove duplicate records