Edit RichTextBox programmatically without losing formatting

Question

I have formatted text in the rtf file and I load it to my richTextBox. It works fine, but then I want to remove some text parts programmatically. If I do like that:

richTextBox.LoadFile("TextFile.rtf");
richTextBox.Text = richTextBox1.Text.Substring(fromPosition, length);

text formatting disappears. I've tried to work with richTextBox.Lines, but there is no delete or edit function. All I need is to delete parts of loaded text without losing its formatting. Is it possible?

Thanks in advance.

Answer 1

To remove text you first select it, programmatically by setting SelectionStart and -Length. Then you use the Cut Method:

    richTextBox1.SelectionStart = 20;
    richTextBox1.SelectionLength = 120;
    richTextBox1.Cut();

If you want to avoid putting the removed text to the clipboard you can set it to "" instead of 'cutting' it:

    richTextBox1.SelectedText = ""