prompt user to give filename

Use SaveFileDialog to display a standard save dialog, which would allow the user to select where he wants the file to be saved.

Refer : https://msdn.microsoft.com/en-us/library/system.windows.forms.savefiledialog.aspx

Example :

SaveFileDialog dialog = new SaveFileDialog();

dialog.Title = "Save file as...";

dialog.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";

dialog.RestoreDirectory = true;

if (dialog.ShowDialog() == DialogResult.OK)

{

MessageBox.Show(dialog.FileName);

}

Of course, you have to use dialog.FileName when creating your FileStream:

PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(dialog.FileName, FileMode.Create));

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