How can I delete the first line of a textbox in C#

Question

I am currently working on a project and I need to delete the first line of a TextBox. How can I delete this first line? It is supposed to delete the line at every loop. I am using a WindowsFormApp in Visual Studio.

What sort of TextBox? Please tag `WPF`, `WinForms`, `ASP.NET`, etc. to indicate the technology you are working with. — John Wu, Oct 11 '18 at 00:35
If you want to delete 1 line, why do you need a loop? Perhaps some code would help us understand. Certainly [Ask] and the WELCOME [TOUR] would help you understand the site better — Ňɏssa Pøngjǣrdenlarp, Oct 11 '18 at 00:35
The way this place works is that if someone helped you or you feel that their answer was good, you upvote them. If you asked a question, and you ended up using one of the answers, you "accept" it. That way 2 things happen 1) the answerer gets a _"reputation"_ boost, but more importantly, the next person who asks a question like yours gets an indication of which answers were good and answered the question — Flydog57, Oct 12 '18 at 03:27
The reason why I don't put any lines of code is because I speak french and my lines are in french — Alexis Oster, Oct 15 '18 at 00:04

score 0 · Answer 1 · answered Oct 11 '18 at 00:46

You could try this:

ctrl.Text = @"First
                2nd
                3rd";

var lines = multiline.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
ctrl.Text = string.Join(Environment.NewLine, lines.Skip(1));

For more details on how to split the text into lines please see Best way to split string into lines .

score 0 · Accepted Answer · answered Oct 11 '18 at 00:46

0

richTextBox1.Lines = richTextBox1.Lines.Skip(1).ToArray();

answered Oct 11 '18 at 00:46

mr.coffee

962
8
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score 0 · Answer 3 · answered Oct 11 '18 at 03:05

For a plain old Windows Forms multiline text box, this works:

 var wasText = textBox1.Text;
 var lineEndIndex = textBox1.Text.IndexOf(Environment.NewLine);
 if (lineEndIndex >= 0) {
     textBox1.Text = wasText.Substring(lineEndIndex + Environment.NewLine.Length);
 }

How can I delete the first line of a textbox in C#

3 Answers3