Search from Richtextbox function

[kurpeli1]

I have a search textbox called "textBox3"
and richtextbox called "lRichTextB ox1"

I want to make a search function that when I write something to "textbox3" it will then search the text from "lRichTextBox1" .

what i have tried

       private void button4_Click_2(object sender, EventArgs e)
        {
            int aindex = 0;
            while (aindex <lRichTextBox1.Text.LastIndexOf(textBox3.Text))
            {
                lRichTextBox1.Find(textBox3.Text, aindex, lRichTextBox1.TextLength, RichTextBoxFinds.None);
                lRichTextBox1.SelectionBackColor = Color.Blue;

                                aindex = lRichTextBox1.Text.IndexOf(textBox3.Text, aindex) + 1;
            
            }
        }

But after it has found the text, it will then auto-scroll to that text. how is that done?

[SioSio]

Write lRichTextBox1.F ocus(); in button4_Click_2 , add the following description, and scroll to the cursor position.
lRichTextBox1.S crollToCaret();
Or
lRichTextBox1.S elect();