title: Calculate # of Years Alive in C# WinForm
body: <p>I'm trying to finish a quick "demonstration of learning" program by morning for Mothers Day.  I've created a textbox for my mom to enter my birthday and a label to display the number of years, months, days, and seconds I've been alive when she clicks a button.</p>
  
  <p>The following is the part of my code where I am stuck:</p>
  
  <pre><code>private void button1_Click(object sender, EventArgs e)
  {
      DateTime  sonsBirthday = DateTime.Parse(txtSonsBirthday.Text).Date;
  
      DateTime now =  DateTime.Now;
  
      TimeSpan timeSpan = now - sonsBirthday;
      timeSpan = Convert.TimeSpan(lblTimeAlive); // blue squiggly under TimeSpan here
  </code></pre>
  
  <p>As I commented in the code, I get a blue squiggly under <code>TimeSpan</code> in the last line; but I don't understand why.  What am I doing wrong?</p>
  
  <p>I'm just a student: so I've got the concept but am not used to datetime formats and need a little help.</p>