load image files from folder without use opendialog in c#

I convert video to sequence of bitmap image and save as

pictureBox1.Image.Save(@"D:\pic\" + name + ".bmp", ImageFormat.Bmp);

images names save as ( 0001 ,0002 ,0003 ,.............0200) in drive D folder pic

now I have sequence of bitmap I need to load all image files except first image ,I can not

use opendialog because it 199 image i need to use in sequential, how can i do that in c#

such as:

// Load second image // make some operation

//load third image //make some operation