Save a image from the picture box

SaveFileDialog sdlg = new SaveFileDialog();

sdlg.Title = "Select a file name to save Image";
sdlg.Filter = "JPEG File|*.jpg|Bitmap|*.bmp|GIF|*.gif|All File|*.*";
if (sdlg.ShowDialog() != DialogResult.Cancel)
{
Application.DoEvents();

// System.IO.FileInfo f = new System.IO.FileInfo(sdlg.FileName);


switch (System.IO.Path.GetExtension(sdlg.FileName).ToLower())
{
case ".jpg":
pictureBox1.Image.Save(sdlg.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
break;

case ".bmp":
pictureBox1.Image.Save(sdlg.FileName, System.Drawing.Imaging.ImageFormat.Bmp );
break;

case ".gif":
pictureBox1.Image.Save(sdlg.FileName, System.Drawing.Imaging.ImageFormat.Gif);
break;

default:
break;
}




}