Crystal Reports not displaying data from database

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ASP.NET

C#3.5

CrystalReports

I have a web form that prints out a report using Crystal Reports. The data is in the database but the report is blank when printing. Why is this happening? Everything worked before. Will it matter if I had a subreport along with this report? Here is the code for the CR viewer.

CRV code behind:

protected void Page_Load(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["HOTConnectionString"].ConnectionString);
            con.Open();
            TextBoxUser_ID.Text = Session["user_id"].ToString();
            CrystalReportViewer1.Visible = true;

            ReportDocument CrystalReport = new ReportDocument();
            ParameterField paramField = new ParameterField();
            ParameterFields paramFields = new ParameterFields();
            ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();

            paramField.Name = "user_id";
            paramField.CurrentValues.Clear();
            paramDiscreteValue = new ParameterDiscreteValue();
            paramDiscreteValue.Value = TextBoxUser_ID.Text;
            paramFields.Add(paramField);
            CrystalReportViewer1.ParameterFieldInfo = paramFields;


            CrystalReport.Load(Server.MapPath("FormFTEReport40.rpt"));
            string sessiontype = TextBoxUser_ID.Text;
            CrystalReport.SetParameterValue("inst_id", TextBoxUser_ID.Text);
            

            string sessionid = TextBoxUser_ID.Text;
            CrystalReport.SetParameterValue("user_id", TextBoxUser_ID.Text);
            CrystalReportViewer1.ReportSource = CrystalReport;
            con.Close();
        }
    }
}

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