Is there a way to catch maximum length PER LINE and not allow user to input more characters if max length PER LINE has been reached?

Question

Good day!

Sorry if I cant make it into code but here\'s my problem:

Im coding C#, using TextBox Control, Multiline = true.

Now, my problem is i need

Answer 1

textBox.OnTextChanged += (EventArgs e) => // invoked on every text change
{
    var lines = myTextBox.Where(x.Length > 5); // Get the long lines
    for (var i; i < lines.Count(); i++)  // iterate over long lines
    {
        lines[i] = lines[i].Substring(0, 5); // replace the line with its substring(stripped) value
    }
}