[BrowsableAttribute(false)]
[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)]
public bool Cancel { get; set; }

<BrowsableAttribute(False)> _
<DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Hidden)> _
Public Property Cancel As Boolean
	Get
	Set

Setting this property to true while a report is being generated stops the report generation process. Any pages already created are kept in the document and can be previewed or printed by an attached print preview control.

Private Sub _btnCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCancel.Click
    c1Report.Cancel = True
    Close()
End Sub

private void _btnCancel_Click(object sender, System.EventArgs e)
{
   c1Report.Cancel = true;
   Close();
}