RichTextBox文本突出显示

Question

In my form there's a UserControl that has multiple RichTextBox 's and TexBox 's.

While tabbing into TextBox 's via keyboard, as soon as a TextBox get focus the entire text in it is highlighted in a blue background. Looks like a default behavior.

Now while tabbing into RichTextBox 's via keyboard, as soon as a RichTextBox get's focus, the cursor is shown inside the box and no text is highlighted with blue background. Probably a default behavior.

How can i make the RichTextBox also to highlight the text in blue background whenit get's focus via keyboard tabbing?

Answer 1

Just use the Enter event and call the SelectAll() method.

private void richTextBox1_Enter(object sender, EventArgs e)
{
    richTextBox1.SelectAll();
}

Answer 2

If you are looking to change the background color rather than select the text you can use something like the following.

    private void richTextBox1_Enter(object sender, EventArgs e)
    {
        richTextBox1.BackColor = Color.LightBlue;
    }
    private void richTextBox1_Leave(object sender, EventArgs e)
    {
        richTextBox1.BackColor = Color.White;
    }