Print Line Numbers in Label from RichTextBox

This blog shows how to Get Line Numbers in labels from RichTextBox

Here is an example of getting line numbers in Label from RichtextBox.

First Take one richtextbox and a label on the form.

then double click on the richtextbox and it will generate richTextBox1_TextChanged event and write the
following code.
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
int i = richTextBox1.SelectionStart;
label1.Text = "Line Number::" + richTextBox1.GetLineFromCharIndex(i);
}