Printing form gives me blank page from printer

Question

Printing form gives me blank page from printer.

 

I used below codes:-

PrintDocument pd = new PrintDocument();
pd.PrinterSettings.PrinterName = cmbprinter.SelectedItem.ToString();
string[] files = Directory.GetFiles(FileDir);
foreach (string file in files)
{
FileInfo file_into = new FileInfo(file);
string short_name = file_into.Name;
pd.DocumentName = short_name;
pd.Print();
}