C# DataTatable pivot Linq

	DataTable Pivot(DataTable dt, DataColumn pivotColumn, DataColumn pivotValue)
        {
            if (dt.isNullOrEmpty() || dt.Rows.Count == 0)
                return null;
            
            // find primary key columns 
            //(i.e. everything but pivot column and pivot value)
            DataTable temp = dt.Copy();
            temp.Columns.Remove(pivotColumn.ColumnName);
            temp.Columns.Remove(pivotValue.ColumnName);
            string[] pkColumnNames = temp.Columns.Cast<DataColumn>()
                .Select(c => c.ColumnName)
                .ToArray();



            // prep results table
            DataTable result = temp.DefaultView.ToTable(true, pkColumnNames).Copy();
            result.PrimaryKey = result.Columns.Cast<DataColumn>().ToArray();
            dt.AsEnumerable()
                .Select(r => r[pivotColumn.ColumnName].ToString())
                .Distinct().ToList()
                .ForEach(c => result.Columns.Add(c, pivotColumn.DataType));
            
            // load it
            foreach (DataRow row in dt.Rows)
            {
                // find row to update
                DataRow aggRow = result.Rows.Find(
                    pkColumnNames
                        .Select(c => row[c])
                        .ToArray());
                // the aggregate used here is LATEST 
                // adjust the next line if you want (SUM, MAX, etc...)
                aggRow[row[pivotColumn.ColumnName].ToString()] = row[pivotValue.ColumnName];
            }

            return result;
        }