Этот пример является устаревшим, посмотрите множество других обновлённых примеров в данной категории. This example shows how to edit some component properties from code. All components of the report are on pages. The pages are in the report object. In order to get a reference to the component object, you must first get a reference to the page. They can be obtained by its name. For example, change text box value in the report:

private void button2_Click(object sender, System.EventArgs e)
{
	stiReport1.Load("..\\Work with Components.mrt");
	((StiText)stiReport1.Pages["Page1"].Components["Text1"]).Text.Value = textBox1.Text;
	stiReport1.Show();
}