C#, Crystal Reports parameter dialog displays randomly

Hi,

I assign Crystal Reports parameter values and the report displays great with no dialog popups, but sometimes the dialog just appears for no reason and I cannot figure out why.
I run a report and it works great, I keep the same parameter values and sometimes change them, but the dialog still only appears randomly.

Please see my code below. This code is only code that is relevant to handling my parameters. I removed any other unnecessary code.

Thanks

public partial class frm_ReportViewer : Form
    {
        CrystalDecisions.CrystalReports.Engine.ReportDocument myReport = new CrystalDecisions.CrystalReports.Engine.ReportDocument();

        private const string PARAMETER_REPORT_HEADER = "ReportHeader";

	private void frm_ReportViewer_Load(object sender, EventArgs e)
        {            
        	string reportPath = "";
        	ArrayList arrayListreportheader = new ArrayList();
		reportPath = Application.StartupPath + "\\" + "creport.rpt";
                myReport.Load(reportPath);
                arrayListreportheader.Add("Header text here");

                //SQL query and fill dataset here

                myReport.SetDataSource(mydataset);
		
		crystalReportViewer1.ReportSource = myReport;
                    
	        ParameterFields parameterFields = myReport.ParameterFields;
       		SetReportHeaderParameterField(parameterFields, arrayListreportheader);
	        
         
        }

private void SetReportHeaderParameterField(ParameterFields parameterFields, ArrayList arrayList)
        {            
            ParameterField parameterField = parameterFields[PARAMETER_REPORT_HEADER];
            ParameterValues currentParameterValues = new ParameterValues();

            foreach (object submittedValue in arrayList)
            {
                ParameterDiscreteValue parameterDiscreteValue = new ParameterDiscreteValue();
                parameterDiscreteValue.Value = submittedValue.ToString();
                currentParameterValues.Add(parameterDiscreteValue);
            }

            parameterField.CurrentValues = currentParameterValues;
        }
}

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