函数（方法）级的授权

参考地址:

http://www.cnblogs.com/vibration/archive/2004/04/29/8054.html

2:http://www.cnblogs.com/yanyangtian/category/186446.html

3:http://www.cnblogs.com/jacktu/archive/2007/12/26/1016133.html

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 只允许WebManager角色访问 Page_Load

   using System.Security.Permissions;

    [PrincipalPermission(SecurityAction.Demand,Role="WebManager")]    protected void Page_Load(object sender, EventArgs e)    {     }