problem in using dsSample

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C#

ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Net.Security;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ReportDocument RD = new ReportDocument();
     //dsSample ds=new dsSample()   //.xsd file name

    }

}

i am making crystal report but when i wrie a code for .xsd file dsSample ds=new dsSample() than it is not showing in visual studio 2010(it is not included there). what i have to do???