The following code is For Windows Application:
FolderBrowserDialog folderDlg = new FolderBrowserDialog();
folderDlg.ShowNewFolderButton = true;
DialogResult result = folderDlg.ShowDialog();
if (result == DialogResult.OK)
{
txtBrowse.Text = folderDlg.SelectedPath;
Environment.SpecialFolder root = folderDlg.RootFolder;
}