Question

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?

Answer 1

You just need to concatenate the strings…

var strIP = tb1.Text + '.' + tb2.Text + '.' + tb3.Text + '.' + tb4.Text;
//This is to see it
MessageBox.Show(strIP);

Or you can use a StringBuilder….

var strIP = new StringBuilder();
strIP.Append(tb1.Text);
strIP.Append('.');
strIP.Append(tb2.Text);
strIP.Append('.');
strIP.Append(tb3.Text);
strIP.Append('.');
strIP.Append(tb4.Text);

//This is to see it
MessageBox.Show(strIP.ToString());