Could any one please tell me how do i change the parameters dynamically for a crystal report.

for the first time i am setting the parameter value like this :

dd1.SetParameterValue("id",12);
CrystalReportViewer1.ReportSource=dd1;

it works fine..
but on click of a button "refresh" i want to set the parameter value to a value from textBox "EmpID"
and Re Bind the CrystalReportViewer
i am using this code:


private void Refresh_Click(object sender, System.EventArgs e)
{
CrystalReport3 cr=new CrystalReport3();
int id=int.Parse(EmpID.Text);
cr.SetParameterValue("id",14);
CrystalReportViewer1.ReportSource=cr;
CrystalReportViewer1.DataBind() ;

}


its not working!!
whats wrong or whats missing
Plz help
thanks in advance
Irfan