Save username and password in cookies in asp.net

My web application's home page has a RememberMe checkbox.. If the user checks it, i ll store emailId and password in cookies.. My code is::::

if (this.ChkRememberme != null && this.ChkRememberme.Checked == true)
   {
     HttpCookie cookie = new HttpCookie(TxtUserName.Text, TxtPassword.Text);
     cookie.Expires.AddYears(1);
     Response.Cookies.Add(cookie);
   }