Is it possible to create runtime crystal report?

using System;

using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
public partial class Pages_ReportLoader : System.Web.UI.Page
{
    ReportDocument reportDocument = new ReportDocument();
    ParameterField paramField = new ParameterField();
    ParameterFields paramFields = new ParameterFields();
    ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {

            paramField.Name = "@Dept"
            paramDiscreteValue.Value = "CS";
            paramField.CurrentValues.Add(paramDiscreteValue);
            paramFields.Add(paramField);
            CrystalReportViewer1.ParameterFieldInfo = paramFields;
            reportDocument.Load(Server.MapPath("CrystalReportTest.rpt"));
            CrystalReportViewer1.ReportSource = reportDocument;
            reportDocument.SetDatabaseLogon(---connectionstring---);

        }

    }

    protected void btnShowReport_Click(object sender, EventArgs e)

    {
        paramField.Name = "@Dept";
        paramDiscreteValue.Value = txtParamDept.Text.ToString();
        paramField.CurrentValues.Add(paramDiscreteValue);
        paramFields.Add(paramField);
        CrystalReportViewer1.ParameterFieldInfo = paramFields;
        reportDocument.Load(Server.MapPath("CrystalReportTest.rpt"));
        CrystalReportViewer1.ReportSource = reportDocument;
        reportDocument.SetDatabaseLogon(--connection string--);

    }

}