Highlight all searched words

Question

In my RichtextBox, if I have written as below.

This is my pen,
his pen is beautiful.

Now I search word \"is\"

Answer 1

This will show all the searched criteria at the same time.

Using: 1 Textbox (to enter the text to search for) and 1 Button (to Run the Search).

Enter your search criteria inside the textbox and press search button.

        // On Search Button Click: RichTextBox ("rtb") will display all the words inside the document
    private void btn_Search_Click(object sender, EventArgs e)
    {
        try
        {
            if (rtb.Text != string.Empty)
            {// if the ritchtextbox is not empty; highlight the search criteria
                int index = 0;
                String temp = rtb.Text;
                rtb.Text = "";
                rtb.Text = temp;
                while (index < rtb.Text.LastIndexOf(txt_Search.Text))
                {
                    rtb.Find(txt_Search.Text, index, rtb.TextLength, RichTextBoxFinds.None);
                    rtb.SelectionBackColor = Color.Yellow;
                    index = rtb.Text.IndexOf(txt_Search.Text, index) + 1;
                    rtb.Select();
                }
            }
        }

        catch (Exception ex) { MessageBox.Show(ex.Message, "Error"); }
    }
}

}