Question

I am working on SSRS report. Here is the cs file code:

new protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            String reportTitle = GetValueFromQueryString("ReportTitle");
            /* Get Agency name and set it in report parameters */
            AgencyBO agencyBO = new AgencyBO();
            Agency agency = new Agency();
            agency = agencyBO.GetAgencyInformation();
            List<ReportParameter> lstParam = new List<ReportParameter>();
            lstParam.Add(new ReportParameter("Agency", agency.Name));

            /* Declare parameters that are to be sent to Report Helper class */
            string orderBy = string.Empty,
                   startAge = string.Empty,
                   endAge = string.Empty,
                   sex = string.Empty,
                   staffId = string.Empty,
                   statusId = string.Empty,
                   ethnicityId = string.Empty,
                   treatmentProviderId = string.Empty;

            ConsumerSummaryReportCriteria consumerSummaryReportCriteria = new ConsumerSummaryReportCriteria();
            Dictionary<String, String> lst = consumerSummaryReportCriteria.GetReportParams();
            foreach (var pair in lst)
            {
                /* ---- Set parameters that are to be sent to Report Helper class ---- */
                if (pair.Key == "orderBy" && pair.Value != string.Empty)
                {
                    orderBy = pair.Value;
                }
                if (pair.Key == "startAge" && pair.Value != string.Empty)
                {
                    startAge = pair.Value;
                    lstParam.Add(new ReportParameter("startAge", pair.Value));
                }
                if (pair.Key == "endAge" && pair.Value != string.Empty)
                {
                    endAge = pair.Value;
                    lstParam.Add(new ReportParameter("endAge", pair.Value));
                }
                if (pair.Key == "gender" && pair.Value != string.Empty)
                {
                    sex = pair.Value;
                    lstParam.Add(new ReportParameter("gender", pair.Value));
                }
                if (pair.Key == "staffIds" && pair.Value != string.Empty)
                {
                    staffId = pair.Value;
                }
                if (pair.Key == "consumerStatusIds" && pair.Value != string.Empty)
                {
                    statusId = pair.Value;
                }
                if (pair.Key == "ethnicityIds" && pair.Value != string.Empty)
                {
                    ethnicityId = pair.Value;
                }
                if (pair.Key == "treatmentProviderIds" && pair.Value != string.Empty)
                {
                    treatmentProviderId = pair.Value;
                }

                /* ---- Set parameters to report parameters list that are to be sent to 
                 * RDLC to show report selection criteria at the end of the report ---- */
                if (pair.Key == "staffNames")
                {
                    lstParam.Add(new ReportParameter("staffNames", pair.Value));
                }
                if (pair.Key == "consumerStatusNames")
                {
                    lstParam.Add(new ReportParameter("consumerStatusNames", pair.Value));
                }
                if (pair.Key == "treatmentProviderNames")
                {
                    lstParam.Add(new ReportParameter("treatmentProviderNames", pair.Value));
                }
                if (pair.Key == "ethnicityNames")
                {
                    lstParam.Add(new ReportParameter("ethnicityNames", pair.Value));
                }
            }

            ReportHelper.ApplyReportSetting(ref rptConsumerSummaryReport, reportTitle, orderBy, startAge, endAge, sex, staffId, statusId, ethnicityId, treatmentProviderId);

            rptConsumerSummaryReport.LocalReport.SetParameters(lstParam);
            rptConsumerSummaryReport.LocalReport.Refresh();
        }
    }

It was working perfectly but suddenly stopped working.
A blank aspx page opens and report viewer does not open.

Here is the code of aspx file.

<form id="frmConsumerSummaryReport" runat="server">
<div>
    <asp:ScriptManager ID="scmReport" runat="server">
    </asp:ScriptManager>
    <rsweb:ReportViewer ID="rptConsumerSummaryReport" runat="server" Height="100%" AsyncRendering="False"
        Width="100%" SizeToReportContent="True" Font-Names="Verdana" 
        Font-Size="8pt" InteractiveDeviceInfos="(Collection)" 
        WaitMessageFont-Names="Verdana" WaitMessageFont-Size="14pt">
        <LocalReport ReportPath="Reports\Consumer\ConsumerSummaryReport.rdlc">
        </LocalReport>
    </rsweb:ReportViewer>
</div>
</form>

Answer 1

I added some new parameters in my report after that it stopped working. No idea why this happened. After removing those parameters, it’s working fine again.

EDIT: It was so because those parameter had null value. When I set their property to Allow “” and null values, it started working.