C# save image files using savefiledialog or folderbrowserdialog

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C#

WinForms

PDF

image-conversion

I'm trying to save image files which are converted from PDF to PNG. I want my application to save the converted image if the PDF was a single page document using the "SaveFileDialog", and if the PDF file was a multi-page document, I then want my application to save them into a folder using the "FolderBrowserDialog".

My problem is that if the PDF file was a multi-page document, my code would first save the first image (after conversion) using the "SaveFileDialog" before attempting to save the rest of the images using "FolderBrowserDialog".

Here is what I've tried.

What I have tried:

Image = imageToConvert = null;

for (int i = 0; i < images.Length; i++)
{
    if (i == 0)
    {
        //Save converted image if PDF is single page
         imageToConvert = images[i];

        SaveFileDialog _saveFile = new SaveFileDialog();
        _saveFile.Title = "Save file";
        _saveFile.Filter = "PNG|*.png";
        _saveFile.FileName = Lbl_OriginalFileName.Text;


        if (_saveFile.ShowDialog() == DialogResult.OK)
        {
            imageToConvert.Save(_saveFile.FileName, ImageFormat.Png);

            imageToConvert.Dispose();
        }
        else if (_saveFile.ShowDialog() == DialogResult.Cancel)
        {
            return;
        }
    }
    else
    {
        if (i > 0)
        {
            // Save converted Images if PDF is multi-page
            Image imageToConvert2 = images[i];

            FolderBrowserDialog fbd = new FolderBrowserDialog();
            fbd.ShowDialog();
            fbd.Description = "Select the folder you want save your files into.";

            string pathString = Path.Combine(fbd.SelectedPath, subFolder);
            Directory.CreateDirectory(pathString);

            if (fbd.ShowDialog() == DialogResult.Cancel)
            {
                return;
            }
            
                string saveFileNamesPNG = string.Format(Lbl_OriginalFileName.Text + "_" + i.ToString() + ".png", ImageFormat.Png);
                imageToConvert.Save(Path.Combine(pathString, saveFileNamesPNG));
           
            imageToConvert.Dispose();
        }
    }
}

I would really appreciate any help.