Converting string to Enum

namespace WindowsFormsApplication1
{
enum xx { yes, no};

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
string s = textBox1.Text;

int x =(int) (s == "Fixed" ? xx.yes : xx.no);

}
}
}