Question

How to delete number of lines from richDataTextBox? I need to delete each second line.
For example, I have a text document, opened in rich DataTextBox..

1. "aaaaaaa  
     bbbbbbb  
     ccccccc  
     ddddddd"

How can I delete lines: "bbbbbbb" and "ddddddd"… and continue till the end of the text file.

var lines = this.dataTextBox.Lines;

Answer 1

You can use LINQ to delete every second line:

var lines=richTextBox1.Lines
    . Where((l, index) => index % 2 == 0)
    .Select((l, index) => l);
richTextBox1.Lines = lines.ToArray();

It selects all lines that should not be deleted and skips all others.