C#

private void button1_Click(object sender, EventArgs e)
{
    DialogResult dr = MessageBox.Show("Are you sure you want to close this window?", "Are you sure?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
    if (dr == DialogResult.Yes)
    {
        this.Close();
    }
    //if anything other than Yes is clicked (like No), then nothing will happen.
}

private void button1_Click(object sender, EventArgs e)
{
    DialogResult dr = MessageBox.Show("Are you sure you want to close this window?", "Are you sure?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
    if (dr == DialogResult.Yes)
    {
        this.DialogResult = DialogResult.Cancel; //or whatever
        this.Close();
    }
    //if anything other than Yes is clicked (like No), then nothing will happen.
}

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The apostle Paul, modernly speaking

Judah Himango

Text highlighting is part of the Rich Text Format specification, but is mysteriously missing from the Windows Forms Rich Text Box component.

DigitalKing wrote:

Try this article.