title: browse folder and get user input to create a new file
body: <p>I want to create a file in a directory selected by the user and named it by the user input.<br>
  I tried <strong>FolderBrowserDialog</strong> but it didn't prompt me to give a file name:</p>
  
  <pre><code>FolderBrowserDialog fbd = new FolderBrowserDialog();
  DialogResult result = fbd.ShowDialog();
  string path = fbd.SelectedPath;
  //string FileName; then concatenate it with the path to create a new file
  </code></pre>
  
  <p>how can I do that?</p>