how to close print dialog when user cancel print preview dialog

You're catching dialog result from pd (PrintDialog) not ppd.

You should have additional DialogResult like this:

public void print()
    {
        PrintDialog pd = new PrintDialog();
        PrintDocument pdoc = new PrintDocument();
        PrinterSettings ps = new PrinterSettings();
        PaperSize psize = new PaperSize(); 
        pdoc.DefaultPageSettings.Landscape = false;
        pd.Document = pdoc;
        pd.Document.DefaultPageSettings.PaperSize = psize;
 
        pdoc.PrintPage += new PrintPageEventHandler(pdoc_PrintPage);
 
         DialogResult result = pd.ShowDialog();
         if (result == DialogResult.OK)
         {

             PrintPreviewDialog ppd = new PrintPreviewDialog();
             ppd.Document = pdoc;
/*This dialog result is the important one :)*/
             DialogResult ppdResult = ppd.ShowDialog();

            if (ppdResult == DialogResult.OK )
                 pdoc.Print();
            else
                pd.Close();
         }
}

If this helps, please take time to accept the solution. Thank you.

Hello,

As per my understanding the requirement is to cancel print when user closes or cancel the preview dialog form.

So here assuming the print option will be chosen from the preview dialog form ,
My suggestion is to remove the pdoc.Print() call .

if (result == DialogResult.OK)
{

PrintPreviewDialog ppd = new PrintPreviewDialog();
ppd.Document = pdoc;
ppd.ShowDialog();

// pdoc.Print(); /* remove this call as user will print from preview form or cancel out*/
}

I created as demo code and it works .

Note : I added a blank pdoc_PrintPage() handler as below.

private void pdoc_PrintPage(object sender, PrintPageEventArgs e)
       {

          // throw new NotImplementedException();

       }

Thanks

A Preview.Close() command after Preview.ShowDialog() can never be reached,
because you have to close the Preview in order to reach it. So you must
call Preview.Close() from somewhere else.

When printing starts with document.Print, document_StartPrint is called,
when printing is finished, document_EndPrint is called. It seems that
Preview.ShowDialog does internally call document.Print, but the output
is redirected to the preview window. When you click the printer icon in
Previwe, document.Print is called again, this time with the selected
printer.

If you put the Preview.Close() command in the EndPrint function, it is
called from outside the Preview and closes. But you must not close while
the preview is being produced, so EndPrint must know when this is the
case.

The solution which works for me is:

Declare the following global variables:

private static bool InPreview;
private static PrintPreviewDialog Preview;

Add the EndPrint function to your document, and gefore calling the dialog,
set InPreview to true:

PrintDialog PD = new PrintDialog();
...
doc = new PrintDocument();
doc.EndPrint += new PrintEventHandler(doc_EndPrint);
...
if (PD.ShowDiadog() == DialogResult.OK) {
...
InPreview = true;
Preview.ShowDialog();
}

The EndPrint function looks like this:

private static void doc_EndPrint(object sender, PrintEventArgs e) {
if(InPreview) {
InPreview = false;
} else {
if(Preview != null) {
Preview.Close();
}
}
}