This example shows how to render and export reports asynchronously. First, specify the path to the reports:

...

	public FormMain()
	{
		InitializeComponent();

		labelLoad.Text = "Loading... ";

		Report = new StiReport();
		Report.Load("..\\MasterDetail.mrt");

		labelLoad.Text += "OK";
	}

...

Next, use RenderAsync() method to render the report:

...

	private async void buttonRender_Click(object sender, EventArgs e)
	{
		labelRender.Text = "Rendering... ";

		await Report.CompileAsync(); // if compilation is needed
		await Report.RenderAsync();

		labelRender.Text += "OK";
	}
	
...

After that, use ExportDocumentAsync() method to export the report:

...

	private async void buttonExport_Click(object sender, EventArgs e)
	{
		saveFileDialog.FileName = Report.ReportName + ".pdf";
		if (saveFileDialog.ShowDialog() == DialogResult.OK)
		{
			labelExport.Text = "Exporting... ";

			await Report.ExportDocumentAsync(StiExportFormat.Pdf, saveFileDialog.FileName);

			labelExport.Text += "OK";
		}
	}
	
...

In the screenshot below you can see the result of the sample code: