Error in Crystal Report in my asp web application

Error	1	The type or namespace name 'myreport' could not be found (are you missing a using directive or an assembly reference?)	F:\myaspcrystal\Default.aspx.cs	49	9	F:\myaspcrystal\

Error	3	The name 'crystalReportViewer1' does not exist in the current context	F:\myaspcrystal\Default.aspx.cs	77	9	F:\myaspcrystal\

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.IO;
using System.Collections.Generic;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;

public partial class _Default : System.Web.UI.Page 
{
    public static string connectionString = "Data Source=FAROOQPC\\SQLEXPRESS; Initial Catalog=mydb; Integrated Security=True";

    private SqlDataAdapter  dataAdapter;
    private DataSet dataSet;
    private DataTable dataTable;

    // *** End ADO.NET objects ***
    private static string Name;
    private static string Cell;
    private static string Address;
    //private static string EmpId;
    protected void Page_Load(object sender, EventArgs e)
    {
        string commandstring = "select * from db";

        // The link between the sql command and the database connection
        dataAdapter = new SqlDataAdapter(commandstring, connectionString);

        // Define insert, update, and delete sql commands to use.
        //    BuildCommands();

        // Declare and fill the in-memory dataset from the database
        dataSet = new DataSet();
        dataSet.CaseSensitive = true;
        dataAdapter.Fill(dataSet, "Employee");


        myreport Report = new myreport(); //error line 1
        
        
        
             
        
        mydataset ds=new mydataset();
        mydataset.DataTable1DataTable t = (mydataset.DataTable1DataTable)ds.Tables[0];

        dataTable = dataSet.Tables[0];


        foreach (DataRow dataRow in dataTable.Rows)
        {
            // Load global strings from column values in the datarow
            //CustId = dataRow[""].ToString().Trim();
            Name = dataRow["Name"].ToString().Trim();
            Cell = dataRow["Cell"].ToString().Trim();
            Address = dataRow["Address"].ToString().Trim();


            t.AddDataTable1Row(Name, Cell, Address);
        }



        Report.SetDataSource(ds);

        crystalReportViewer1.ReportSource = Report;     //Error Line 2            
 
    }
}