i'm following this example: https://docs.telerik.com/reporting/embedding-reports/program-the-report-definition/access-report-items-programmatically
when it comes to this:
protected void Button1_Click(object sender, EventArgs e)
{
Telerik.Reporting.InstanceReportSource instanceReportSource = (Telerik.Reporting.InstanceReportSource)this.reportViewer1.ReportSource;
Telerik.Reporting.Report report = (Telerik.Reporting.Report)instanceReportSource.ReportDocument;
Telerik.Reporting.TextBox txt = report.Items.Find("productNameDataTextBox", true)[0] as Telerik.Reporting.TextBox;
}
but in my situation I have a UriReportSource,
how can i get InstanceReportSource from a UriReportSource?