how to show radio button(visible=true) when two check boxes checked in asp vb.net

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
   if (CheckBox2.Checked == true)
   { 
      RadioButton1.Value = true;
   }
}
protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
{
   if (CheckBox1.Checked == true)
   { 
      RadioButton1.Value = true;
   }
}