private void DoPreviewPrint()
{   
    // Create and use List & Label object
    using (ListLabel LL = new ListLabel())
    {
        // Define/Assign data source
        LL.DataSource = CreateDataSet();
       
        // Bind preview control to the List & Label object
        LL.PreviewControl = LLPreviewControl;
       
        // Set print mode to preview control
        LL.AutoDestination = LlPrintMode.PreviewControl;
       
        // Prevent opening the resulting XML file with formular data
        LL.ExportOptions.Clear();
        LL.ExportOptions.Add(LlExportOption.ExportShowResult, "0");
       
        // Register event to define project parameters for autoamtically and silently saving formular data
        LL.DefinePrintOptions += new DefinePrintOptionsHandler(LL_DefinePrintOptions);
       
        // Print
        LL.Print();
    }
}

void LL_DefinePrintOptions(object sender, EventArgs e)
{
    // Get the calling List & Label object
    ListLabel localLL = sender as ListLabel;
   
    // Define project parameters for autoamtically and silently saving formular data
    localLL.ProjectParameters[LlProjectParameter.SaveAsFormat].Value = "XML";
    localLL.ProjectParameters[LlProjectParameter.SaveAsFilename].Value = @"C:\temp\myFormData.xml";
    localLL.ProjectParameters[LlProjectParameter.SaveAsNoSaveQuery].Value = "1";
    localLL.ProjectParameters[LlProjectParameter.SaveAsShowDialog].Value = "0";
}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    // Be sure the formular data become saved
    if (LL.Core.IsPrinting || !LLPreviewControl.CanClose())
        e.Cancel = true;
}