SubReport throwing No Data

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C#

ASP.NET

RDLC

I Used RDLC in my Asp Page but main Report is comming but subreport not comming

<rsweb:ReportViewer ID="ReportViewer1"  runat="server" Font-Names="Verdana" Font-Size="8pt"
                                    InteractiveDeviceInfos="(Collection)" WaitMessageFont-Names="Verdana" WaitMessageFont-Size="14pt"
                                    Width="652px">
                                    <LocalReport ReportPath="Student\MyGrade.rdlc">
                                        <DataSources>
                                            <rsweb:ReportDataSource DataSourceId="ObjectDataSource1" Name="MyGrade" />
                                        </DataSources>
                                    </LocalReport>
                                </rsweb:ReportViewer>

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetData"
                              TypeName="MyGradeTableAdapters.usp_mygrading_1TableAdapter" OldValuesParameterFormatString="original_{0}">
                              <SelectParameters>
                                  <asp:SessionParameter  Name="id" SessionField="Stud_id" Type="Int32" />
                              </SelectParameters>
                          </asp:ObjectDataSource>

protected void Page_Load(object sender, EventArgs e)
 {
     try
     {

         if (!IsPostBack)
         {
             this.ReportViewer1.LocalReport.SubreportProcessing += new                 SubreportProcessingEventHandler(prcProcessSubReport);

         }

     }

     catch
     { }
 }

private void prcProcessSubReport(object sender, SubreportProcessingEventArgs e)
   {
       e.DataSources.Clear();

       DataTable dtSubReport = new DataTable();
       ReportDataSource Subreport1;
       try
       {

           SqlConnection thisConnection = new SqlConnection(connection);
           DataSet ds = new DataSet();
           SqlDataAdapter adapter = new SqlDataAdapter();
           thisConnection.Open();
           SqlCommand cmd = new SqlCommand();
           cmd.CommandText = "usp_mygrading_2";
           cmd.CommandType = CommandType.StoredProcedure;
           cmd.Parameters.Add(new SqlParameter("@id", e.Parameters["id"].Values[0].ToString()));
           cmd.Parameters.Add(new SqlParameter("@exam", e.Parameters["examid"].Values[0].ToString()));

           cmd.Connection = thisConnection;
           adapter = new SqlDataAdapter(cmd);
           adapter.Fill(ds);

           Subreport1 = new ReportDataSource("MyGrade2", dtSubReport);

           e.DataSources.Add(Subreport1);







       }
       catch (Exception ex)
       {

       }
       finally
       {
           dtSubReport = null;
           Subreport1 = null;

       }
   }

I passing Parameter also and i am getting data in coding but when viewing it showing no data
Please Help me..