First, create you folder...
private string GetTempDirectory()
{
string path = Path.GetRandomFileName();
Path.Combine(Path.GetTempPath(), path);
Directory.CreateDirectory(path);
return path;
}
This will create the directory, but not a file to go in.
You save copies of the images to this directory.
Once finished with them, then delete the directory.
Directory.Delete(path,true);
Hope that helps.