C# Automation Multiline String Trim

Question

I am wondering how I can trim every string of an array after a certain char, for example I have 1 textbox in which I put a multiline string like:

HelloWorld:123

IAmABerliner:JFK

and then I want to click a Button and in the second TextBox everything in every line should be trimmed after the ":"

Output in Textbox 2:

HelloWorld

IamABerliner

Answer 1

Use the string.Split method, and take just the first part of it:

string result = textBox2.Text.Split(':')[0];

For multiline strings:

string result = string.Empty;

foreach (string line in textBox2.Text.Split(Environment.NewLine.ToCharArray()))
{
    result += line.Split(':')[0] + Environment.NewLine;
}