private void toolStripMenuItem2_Click(object sender, EventArgs e)
{
const word As string = richTextBox1.Text;
richTextBox1.Select(richTextBox1.Text(indexof(word, StringComparsion.Ordinal), word.Length));
richTextBox1.SelectionColor = Color.Red;
richTextBox1.SelectionFont = new Font(richTextBox1.Font.FontFamily, richTextBox1.Font.Size, FontStyle.Bold);
}