Getting specific random number

i want to generate random number between (1 to 6),is there any way to change the chance of geting number 6 more than other numbers?

for example for this code

    private void pictureBox5_MouseClick(object sender, MouseEventArgs e)
    {
        Random u = new Random();
        m = u.Next(1,6);
        label2.Text = m.ToString();
    }