enable/disable of buttons, textboxes

Question

when 1 of the radio button is enabled, i need to disable 2nd radio button and one of the textbox, I have done like this but its not working, please help me out with this.

 

Private void radiobutton1_CheckedChanged(object sender, eventargs e)

{

if (radioButton1.Checked == true)

{

radioButton2.Enabled = false;

textBox1.Enabled = false;

}

}