"This row already belongs to another table" Error

 DataTable dataTableWithDifferences = comparer.Compare();               DataTable sourcetable  = GetData1();               DataTable destinationtable = GetData2();             var updateRecords = (from table1 in destinationtable.AsEnumerable()                                  join table2 in dataTableWithDifferences.AsEnumerable()                                  on (string)table1["UserID"] equals (string)table2["UserID"]                                  select table2);             DataTable dtUpdates = sourcetable.Clone();             updateRecords.ToList().ForEach(row => dtUpdates.ImportRow(row));
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