Allow user to only input text?
<p>how do I make a boolean statement to only allow text? I have this code for only allowing the user to input numbers but ca'nt figure out how to do text.</p>

<pre><code> bool Dest = double.TryParse(this.xTripDestinationTextBox.Text, out Miles);
 bool MilesGal = double.TryParse(this.xTripMpgTextBox.Text, out Mpg);
 bool PriceGal = double.TryParse(this.xTripPricepgTextBox.Text, out Price);
</code></pre>
