.NET (Core and Framework)

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            XmlDocument xd = new XmlDocument();
            xd.LoadXml(stmp);

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            var node = xd.DocumentElement as XmlNode;
            XmlReader reader1 = new XmlNodeReader(node);
            dsQuery.ReadXml(reader1);

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            var v2 = dsQuery.Tables["row"].Rows[4][dsQuery.Tables["row"].Columns[2].ColumnName];