如何给Crystal Report中的参数赋值

代码如下：

protected void CrystalReportViewer1_Load(object sender, EventArgs e)
    {
        ParameterFields pFields = new ParameterFields();
        ParameterField pField1 = new ParameterField();
        ParameterField pField2 = new ParameterField();
        ParameterDiscreteValue pValue1 = new ParameterDiscreteValue();
        ParameterDiscreteValue pValue2 = new ParameterDiscreteValue();

        pValue1.Value = 3;
        pField1.Name = "p1";
        pField1.CurrentValues.Add(pValue1);
        pFields.Add(pField1);

        pValue2.Value = 10;
        pField2.Name = "p2";
        pField2.CurrentValues.Add(pValue2);
        pFields.Add(pField2);
       
        CrystalReportViewer1.ParameterFieldInfo = pFields;
    }