title: Combine multiple textbox text into a string in C#
body: <p>I'm trying to do a program for the user to key in IP addresses. I created 4 text box and user will key in 3 numbers to each text box. In the end I need to combine this 4 text box so that it can become a valid IP address. This IP address will put into a string so that I can send it through serial port. How do we do it?</p>