title: How to get back the focus of already opened window in C# Windows forms
body: <p>I have a windows application. When I click on a button another process starts which pops up the help window. I only want to open 1 window. So if I click on the button I am checking if the process is already started. The problem I am facing is how get the focus of the window that I opened.  </p>
  
  <pre><code>if (processes.Length == 0)
  {
        Process.Start();
  }
  else
  {
    // Need to focus on the window already opened. 
  }
  </code></pre>