Pivot table in c# entity framework

publicpartialclass Form1 : Form
{public Form1( )
  {
    InitializeComponent( );
  }privatevoid button1_Click( object sender, EventArgs e )
  {// The ObjectContext I created using EF
    ISOEntities ctx = new ISOEntities();// A Linq to EF which creates a List of concreate class called IsoPivot.
    List<IsoPivot> queryResults = 
      (from iso in ctx.ISOesorderby iso.ISOCode ascending , iso.Year ascendinggroup iso by iso.ISOCode into isoGroupselectnew IsoPivot()
            {
              ISOCode = isoGroup.Key,
              Description = isoGroup.Select(d => d.Description).FirstOrDefault(),
              Year = isoGroup.Select(y => y.Year),
              Value = isoGroup.Select(v => v.Value)
            }).ToList();// Call a function to create a dynamically created data table with the needed columns
    PopulateGrid(queryResults);
  }private DataTable dt;privatevoid PopulateGrid(List<IsoPivot> qr)
  {// Create a DataTable as a DataSource for the grid
    dt = new DataTable();// Create the DataColumns for the data table
    DataColumn dc = new DataColumn("ISO Code", typeof(string));
    dt.Columns.Add(dc);
    dc = new DataColumn( "Description", typeof( string ) );
    dt.Columns.Add( dc );// Get a list of Distinct yearsvar yearLabel = (from yList in qr.Select(year => year.Year)from year in yListselect year.ToString()).Distinct().ToList();// Create the DataColumns for the table
    yearLabel.ForEach( delegate( string year )
    {
      dc = new DataColumn( year, typeof( string ) );
      dt.Columns.Add( dc );        
    });// Populate the rowa of the DataTableforeach (IsoPivot rec in qr)
    {// The first two columns of the row always has a ISO Code and Description
      DataRow dr = dt.NewRow();
      dr[0] = rec.ISOCode;
      dr[1] = rec.Description;// For each recordvar years = rec.Year.ToList();var values = rec.Value.ToList();// Because each row may have different years I am indexing// the with the string namefor( int i = 0; i < values.Count; i++ )
      {
        dr[years[i].ToString()] = values[i];
      }// Add the DataRow to the DataTable
      dt.Rows.Add(dr);
    }// Bind the DataTable to the DataGridView
    dataGridView1.DataSource = dt;

  }

}

publicclass IsoPivot
{publicstring ISOCode { get; set; }publicstring Description { get; set; }public IEnumerable<int> Year { get; set; }public IEnumerable<decimal> Value { get; set; }
}