ObjectDataSource fra kode

Jeg får en fejl når jeg kører følgende kode. Nogen der har en god ide(The type specified in the TypeName property of ObjectDataSource 'ObjectDataSource1' could not be found. )?

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;

public partial class _Default : System.Web.UI.Page
{ 
    protected void Page_Load(object sender, EventArgs e)
    {       
        ObjectDataSource1.TypeName = "DAL";
        ObjectDataSource1.SelectMethod = "GetValues";
        GridView1.DataSourceID = ObjectDataSource1.ID;
    }
}

public class DAL
{
    public System.Collections.Generic.List<Val> GetValues()
    {
        System.Collections.Generic.List<Val> list = new System.Collections.Generic.List<Val>();
        Val val1 = new Val();
        val1.Col1 = "Ijiooo";
        val1.Col2 = "Ijiooo";

        Val val2 = new Val();
        val2.Col1 = "Ijiooo";
        val2.Col2 = "Ijiooo";

        list.Add(val1);
        list.Add(val2);

        return list;
    }
}

public class Val
{
    string _Col1 = string.Empty;
    string _Col2 = string.Empty;
    public string Col1
    {
        get { return _Col1; }
        set { _Col1 = value; }
    }
   
    public string Col2
    {
        get { return _Col2; }
        set { _Col2 = value; }
    }
}