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copied!<p>The key is using System.Data.DataRelation to join your 2 datatables on a common column (or columns).</p> <p>Here's some code derived from a post at <a href="http://kseesharp.blogspot.com/2007/12/compare-2-datatables-and-return-3rd.html" rel="nofollow noreferrer">KC's See Sharp Blog</a></p> <pre><code>public DataTable GetImproperRecords(DataTable ProperRecords, DataTable ImproperRecords) { DataTable relatedTable = new DataTable("Difference"); try { using (DataSet dataSet = new DataSet()) { dataSet.Tables.AddRange(new DataTable[] { ProperRecords.Copy(), ImproperRecords.Copy() }); DataColumn properColumn = new DataColumn(); properColumn = dataSet.Tables[0].Columns[1]; // Assuming subsNumber is at index 1 DataColumn improperColumn = new DataColumn(); improperColumn = dataSet.Tables[1].Columns[0]; // Assuming subsNumber is at index 0 //Create DataRelation DataRelation relation = new DataRelation(string.Empty, properColumn, improperColumn, false); dataSet.Relations.Add(relation); //Create columns for return relatedTable for (int i = 0; i < ImproperRecords.Columns.Count; i++) { relatedTable.Columns.Add(ImproperRecords.Columns[i].ColumnName, ImproperRecords.Columns[i].DataType); } relatedTable.BeginLoadData(); foreach (DataRow parentrow in dataSet.Tables[1].Rows) { DataRow[] childrows = parentrow.GetChildRows(relation); if (childrows != null && childrows.Length > 0) relatedTable.LoadDataRow(parentrow.ItemArray, true); } relatedTable.EndLoadData(); } } catch (Exception ex) { Console.WriteLine(ex.Message); } return relatedTable; } </code></pre>

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