When i call subreport with programmatically, it has error "object reference not set for subreport" on the first text box that contain field.

[Santichai]

IDE : Visual Studio 2015
Reporting Version : Q2 2016 (10.1.16.615)
Host: IISExpress

I create DummyMain report that must be call DummySubreport with programmatically.
When i run the report on first time after start solution, the TextBox with expression Fields.Id has error "object reference not set for subreport" on the first page but other page has not error.

Please, see the error image and report in the attachment file. 

link:https://drive.google.com/file/d/0B9yIfZcD3RmJX2dGR3RoOHo2ajg/view?usp=sharing 

Let me know what needs to be fix?  Thanks.

[Katia]

Hello Santichai,

Inside the event handler, you need to use the processing element instead of the report's private field, for example:

void report_NeedDataSource(object sender, EventArgs e)
{
            List<TestItem> items = new List<TestItem>();
            items.Add(new TestItem() { Id = 1, Name = "Person 1" });
            items.Add(new TestItem() { Id = 2, Name = "Person 2" });
            items.Add(new TestItem() { Id = 3, Name = "Person 3" });

            Telerik.Reporting.Processing.Report processingReport = (Telerik.Reporting.Processing.Report)sender;
            processingReport.DataSource = items;
}

You can check Understanding Events help article for more detailed information.


Regards,
Katia
Telerik by Progress