parameter is missing a value error with reportviewer

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I put a parameter call 'Title' in my report. When I load the page, it show a message stated 'The 'Title' parameter is missing a value' error appear. When I click button to active the reportviewer, this message appear again. If I click button to active the control, then the error will disappear, and function normally.
What can I do to solve this?

private void BindReport()
{
    string strregion="";
    if (cbAll.Checked)
    {
        strregion = "a.region_cd <>''";
    }
    if (cbListOnly.Checked)
    {
        strregion = " a.region_cd like '" + ddlArea.SelectedItem.Value + "%'";
    }

    using (MySqlConnection conn = new MySqlConnection(cnstr))
    {
        conn.Open();

        string areadt = "SELECT a.*,b.*,c.*  From school as a left join (ref_region as b, lecturer as c,school as d) " +
            "on (a.region_cd=b.cd and a.lecturer_id=c.lecturer_id) " +
           "WHERE " + strregion + " and a.established_dt between " + "'" + ddlSYear.SelectedValue + "-" + ddlSMonth.SelectedValue + "-01' and '" + ddlEYear.SelectedValue + "-" + ddlEMonth.SelectedValue + "-31' and " +
            "a.school_type_cd='2'  ORDER BY a.origination_temple_id,a.established_dt";
        MySqlDataAdapter data = new MySqlDataAdapter(areadt, conn);
        data.Fill(dt);
        conn.Close();
    }
    rptViewer1.LocalReport.DataSources.Clear();
    ReportDataSource rptData = new ReportDataSource("DataSet1", dt);
    LocalReport r = new LocalReport();
    r.ReportPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "~/ReportForm/JTListByArea.rdlc");
    r.DataSources.Add(rptData);
    rptViewer1.LocalReport.DataSources.Add(rptData);
    rptViewer1.LocalReport.ReportPath = Server.MapPath("~/ReportForm/JTListByArea.rdlc");
    rptViewer1.LocalReport.Refresh();
}

and source:

<rsweb:ReportViewer ID="rptViewer1"  runat="server" Font-Names="Verdana" Font-Size="8pt" WaitMessageFont-Names="Verdana"
    WaitMessageFont-Size="14pt" Style="margin-right: 116px" Width="1200px" DocumentMapCollapsed="False" PageCountMode="Actual"
    PromptAreaCollapsed="True">
    <LocalReport ReportPath="ReportForm\JTListByArea.rdlc">
    </LocalReport>
</rsweb:ReportViewer>

Posted 9-Jan-16 3:09am

Member 12115140

Updated 11-Jan-16 3:31am

v2

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Comments

[no name] 9-Jan-16 9:23am

Can you share relevant what happens in button click and how data is binding to reportviewer..

Patrice T 10-Jan-16 1:57am

You can show relevant code.

Member 12115140 11-Jan-16 9:32am

I had put the code to the question

Richard Deeming 11-Jan-16 12:44pm

Your code is vulnerable to SQL Injection[^].

NEVER use string concatenation to build a SQL query. ALWAYS use a parameterized query.

Member 12115140 12-Jan-16 3:46am

Thank you for your advise

Member 12115140 12-Jan-16 0:23am

you means this cause the error?

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dnibbo · Accepted Answer · 2016-01-14T01:24:00

Agree with what people are saying regarding the sql injection etc... however to get back to the op question...!

Where do you declare your report parameters?

Normally I do something like:...

VB.NET

Dim rptParameter As ReportParameter
rptParameter = New ReportParameter("Title", "Report Title Name")

rptViewer1.LocalReport.SetParameters(rptParameter)

Without checking this may need to be an array of parameters...