退出登录方法，清除相关的cookies和session

/// <summary>
/// 退出登录
/// </summary>
public void LoginOut()
{
Session.Abandon();
if (Request.Cookies["loginId"] != null && Request.Cookies["pwd"] != null && Request.Cookies["id"] != null)
{
Response.Cookies["id"].Expires = DateTime.Now.AddYears(-10);
Response.Cookies["loginId"].Expires = DateTime.Now.AddYears(-10);
Response.Cookies["pwd"].Expires = DateTime.Now.AddYears(-10);
}
Response.Write("<script> top.location.href='Login.aspx'; </script>");
}