problem crystal report and aspx

Question

i made a crystal report and using two parameter OrderNo,and CustName i want to display parameters on my aspx1 page ,aspx1 page

have two dropdown one for orderno and other for CustName and one button when user select the these two value from dropdown 

and click the button then its value pass to aspx2crystal report page for filtering .....please give me an example

please also suggest how to convert the dropdownlist value or datepicker selectedDate  for sesson variable..

this below code is suggested by one member of  this site  but it is not work...... 

protected void Button1_Click(object sender, EventArgs e) 
{ 
DropDownList1.SelectedValue = Session["OrderNo"].ToString(); 
} 

now in ur page2.aspx add a CrystalReportViewer and in page load add this code 
protected void Page_Load(object sender, EventArgs e) 
{ 
ReportDocument rpt = new ReportDocument(); 
rpt.Load(Server.MapPath("Report.rpt")); 
ParameterFieldDefinitions crParameterFieldDefinitions; 
ParameterFieldDefinition crParameterFieldDefinition; 
ParameterValues crParameterValues = new ParameterValues(); 
ParameterDiscreteValue crParameterDiscreteValue = new ParameterDiscreteValue(); 
crParameterDiscreteValue.Value = Session["OrderNo"]; 
crParameterFieldDefinitions = rpt.DataDefinition.ParameterFields; 
crParameterFieldDefinition = crParameterFieldDefinitions["@OrderNo"]; 
crParameterValues = crParameterFieldDefinition.CurrentValues; 
crParameterValues.Clear(); 
crParameterValues.Add(crParameterDiscreteValue); 
crParameterFieldDefinition.ApplyCurrentValues(crParameterValues); 
CrystalReportViewer1.Visible = true; 
CrystalReportViewer1.ReportSource = rpt; 
CrystalReportViewer1.DisplayGroupTree = false; 
}