'WPF RichTextBox - How to get second line?

I would like to choose the second or other line from RichTextbox instead of the first or last line. I know this is the code for selecting the first line and the last line. But how do you choose the second line?

rtb.Document.Blocks.FirstBlock; //First line
rtb.Document.Blocks.LastBlock; //Last line
c++sharpwpfrichtextbox


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