Question

Background:

I am writing a C# form program with MSVS 2010. The form has 2 textboxes: textBox1 (input, single line) and textBox2 (output, multiple lines).

I want to enter a string in textBox1 and when a condition is met it prints some text to textBox2. I want to be able to enter multiple inputs and print output to textBox2 and not erase the previous output.

Questions:

1. My question is can this be done?
2. If not can you use multiple text boxes and move the output to the next higher value text box?

Answer 1

All you need to do is keep appending to the text property.

string output = "Hi!";
outputBox.Text += output + Environment.NewLine;

This is, of course, after you’ve given your textbox a more meaningful name than textBox2

Bonus: You can also prepend to the text if you prever new output to appear at the top:

outputBox.Text = output + Environment.NewLine + outputBox.Text;