Add Sub Report in Crystal Report windows application c#

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C#

hi to all,
Good After Noon
this is Hem Raj Thakur and I want to add sub report in a crystal report Header part in all report(windows application C#.net).
I am adding a sub report and type a code like:---
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private void Area_Report_Load(object sender, EventArgs e)
{
   try
   {
      string str = "select a.areaname as Area_Name, b.cname as Country,c.sname as State,d.dname as District from tbl_area a inner join tbl_country b on a.cid = b.cid inner join tbl_district d on a.did = d.did and b.cid = d.cid inner join tbl_state c on a.sid =c.sid and a.cid = c.cid and d.sid =c.sid";
      SqlDataAdapter da = new SqlDataAdapter(str, con);
      DataSet_Area ds = new DataSet_Area();
      da.Fill(ds);

      string str1 = "select depid,depname,loc from tbl_Department";
      SqlDataAdapter da1 = new SqlDataAdapter(str1, con);
      DataSet_Dept ds1 = new DataSet_Dept();
      da.Fill(ds1);

      CrystalReport_Area report = new CrystalReport_Area();
      report.SetDataSource(ds.Tables[1]);
      crystalReportViewer1.ReportSource = report;
      //crystalReportViewer1.Refresh();
      //-----------------------Add Sub Report---------------------
      ReportDocument subreport = new ReportDocument();
      //Error Sub Report is not loading please help?
      subreport.Load("CrystalReport_Dept.rpt"); //--Sub Report is not Load
      //subreport.Load(Server.MapPath("CrystalReport6.rpt"));
      subreport.Database.Tables[0].SetDataSource(ds1.Tables[1]);
      report.Subreports["CrystalReport_Dept.rpt"].SetDataSource(ds1.Tables[1]);
   }
   catch (Exception)
   { }
}

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Please help Me. It is Urgent..........

thanks in advance.
regards
Hem Raj Thakur