obtener path de archivos (imagenes)

public string getpath()
{
OpenFileDialog dialog = new OpenFileDialog();
dialog.Title = "Abrir archivos jpg...";
dialog.Filter = "Text files (*.jpg)|*.jpg|All files (*.*)|*.*";
dialog.RestoreDirectory = true;

if (dialog.ShowDialog() == DialogResult.OK)
return dialog.FileName;
else
return null;

}