public abstract class DataExporter
    {
        public void ReadData()
        {
            Console.WriteLine("Data is reading from SQL Server Database");
        }

        public void ProcessData()
        {
            Console.WriteLine("Data is processing...!");
        }

        public abstract void PrintData();

        public void GetReport()
        {
            ReadData();
            ProcessData();
            PrintData();
        }
    }

    public class ExcelExporter : DataExporter
    {
        public override void PrintData()
        {
            Console.WriteLine("Data exported to Microsoft Excel!");
        }
    }

    public class PDFExporter : DataExporter
    {
        public override void PrintData()
        {
            Console.WriteLine("Data exported to PDF!");
        }
    }

            DataExporter dataExporter = new ExcelExporter();
            dataExporter.GetReport();
            Console.WriteLine("****************************");
            dataExporter = new PDFExporter();
            dataExporter.GetReport();

using System;
using System.Collections.Generic;
using System.Linq;

namespace PivotExtensions
{
    public static class Ext
    {
        public static Dictionary<TKey1, Dictionary<TKey2, TValue>>
                        Pivot<TSource, TKey1, TKey2, TValue>
                        (
                            this IEnumerable<TSource> source,
                            Func<TSource, TKey1> key1Selector,
                            Func<TSource, TKey2> key2Selector,
                            Func<IEnumerable<TSource>, TValue> aggregate
                        )
        {
            return source.GroupBy(key1Selector)
                         .Select(
                            key1Group => new
                                {
                                    Key = key1Group.Key,
                                    Value = key1Group.GroupBy(key2Selector)
                                         .Select(
                                            key2Group => new
                                               {
                                                   K = key2Group.Key,
                                                   V = aggregate(key2Group)
                                               })
                                         .ToDictionary(e => e.K, o => o.V)
                                })
                         .ToDictionary(e => e.Key, o => o.Value);
        }
    }
}

var list = ExpenseDataSource.ExpensesDataSource();
var pivotList = list.Pivot(
                x =>
                    new
                    {
                        x.Date.Year,
                        x.Date.Month
                    },
                  x1 => x1.Department,
                  x2 => x2.Sum(x => x.Expenses));

var list2 = StudentsStatDataSource.CreateWeeklyReportDataSource();
var lst = list2.Pivot(
                x =>
                    new 
                    {
                        x.Id,
                        x.Name
                    },
              x1 => "Day " + x1.Date.Day,
              x2 => x2.First().IsPresent);

<Report>
    <DocumentPreferences RunDirection="RTL" PageOrientation="Portrait" PageSize="A4">
        <Watermark RunDirection="" Text="پس زمینه نمونه" Font="bardia.ttf" FillOpacity="0.7" StrokeOpacity="0.5" />
    </DocumentPreferences>
    <DefaultFonts  PrimaryFont="irsans.ttf" SecondaryFont="farnaz.ttf" Size="12px" Color="#CCFFBB" /> 
    <DefaultFooter Message="پا صفحه نمونه" />
    <DefaultHeader Message="سرصفحه نمونه" MessageFontColor="#ََََAA0012" ImagePath="logo.png" />
    <MainTableTemplate TemplateName="AppleOrchardTemplate" />
    <MainTablePreferences ColumnsWidthsType="Relative" NumberOfDataRowsPerPage="0" >
        <GroupsPreferences GroupType="HideGroupingColumns" ShowOneGroupPerPage="true" /> 
    </MainTablePreferences>
    <MainTableSummarySettings OverallSummarySettings="جمع کل" PreviousPageSummarySettings="نقل از صفحه قبل" 
                              PageSummarySettings="جمع کل صفحه" AllGroupsSummarySettings="جمع کل گروه ها"   />
    <MainTableDataSource ProviderName="System.Data.SQLُServerCE" 
                         ConnectionString="Data Source=MyData.sdf;Persist Security Info=False;"
                         SqlStatement="SELECT [url], [name], [NumberOfPosts], [AddDate]
                               FROM [tblBlogs]
                               WHERE [NumberOfPosts]>=@p1” >
        <Parameters>
            <Param Type="int" Name="@p1"/>
        </Parameters>
    </MainTableDataSource>
    <MainTableColumns>
        <Columns>
            <Column CellHorizontalAlignment="Right" ColumnItemsTemplate="TextBlock" HeaderCell="عنوان ستون 1" PropertyName="Title" Order="0" Width="1" />
            <Column CellHorizontalAlignment="Right" Group="true" ColumnItemsTemplate="TextBlock" HeaderCell="عنوان ستون 2" PropertyName="Category" Order="1" Width="2" />
            <Column CellHorizontalAlignment="Right" ColumnItemsTemplate="Image" HeaderCell="عنوان ستون 3" PropertyName="Image" Order="2" Width="2" />
        </Columns>
    </MainTableColumns>
    <MainTableEvents> 
        <DataSourceIsEmpty Message="داده ای برای نمایش وجود ندارد" />
    </MainTableEvents>
    <Export ToExcel="True" ToCsv="False" ToXml="True" />
    <Generate Type="AsPdfFile" FileName="Report.pdf" />
</Report>